diff --git a/contrib/03.callcc/callcc.c b/contrib/03.callcc/callcc.c
index f516e8c7..09746077 100644
--- a/contrib/03.callcc/callcc.c
+++ b/contrib/03.callcc/callcc.c
@@ -117,36 +117,36 @@ save_cont(pic_state *pic, struct pic_cont **c)
 
   pic_vm_tear_off(pic);         /* tear off */
 
-  cont = *c = pic_alloc(pic, sizeof(struct pic_cont));
+  cont = *c = pic_malloc(pic, sizeof(struct pic_cont));
 
   cont->wind = pic->wind;
 
   cont->stk_len = native_stack_length(pic, &pos);
   cont->stk_pos = pos;
   assert(cont->stk_len > 0);
-  cont->stk_ptr = pic_alloc(pic, cont->stk_len);
+  cont->stk_ptr = pic_malloc(pic, cont->stk_len);
   memcpy(cont->stk_ptr, cont->stk_pos, cont->stk_len);
 
   cont->sp_offset = pic->sp - pic->stbase;
   cont->st_len = pic->stend - pic->stbase;
-  cont->st_ptr = pic_alloc(pic, sizeof(pic_value) * cont->st_len);
+  cont->st_ptr = pic_malloc(pic, sizeof(pic_value) * cont->st_len);
   memcpy(cont->st_ptr, pic->stbase, sizeof(pic_value) * cont->st_len);
 
   cont->ci_offset = pic->ci - pic->cibase;
   cont->ci_len = pic->ciend - pic->cibase;
-  cont->ci_ptr = pic_alloc(pic, sizeof(pic_callinfo) * cont->ci_len);
+  cont->ci_ptr = pic_malloc(pic, sizeof(pic_callinfo) * cont->ci_len);
   memcpy(cont->ci_ptr, pic->cibase, sizeof(pic_callinfo) * cont->ci_len);
 
   cont->xp_offset = pic->xp - pic->xpbase;
   cont->xp_len = pic->xpend - pic->xpbase;
-  cont->xp_ptr = pic_alloc(pic, sizeof(struct pic_proc *) * cont->xp_len);
+  cont->xp_ptr = pic_malloc(pic, sizeof(struct pic_proc *) * cont->xp_len);
   memcpy(cont->xp_ptr, pic->xpbase, sizeof(struct pic_proc *) * cont->xp_len);
 
   cont->ip = pic->ip;
 
   cont->arena_idx = pic->arena_idx;
   cont->arena_size = pic->arena_size;
-  cont->arena = pic_alloc(pic, sizeof(struct pic_object *) * pic->arena_size);
+  cont->arena = pic_malloc(pic, sizeof(struct pic_object *) * pic->arena_size);
   memcpy(cont->arena, pic->arena, sizeof(struct pic_object *) * pic->arena_size);
 
   cont->results = pic_undef_value();
diff --git a/contrib/10.regexp/src/regexp.c b/contrib/10.regexp/src/regexp.c
index 53134ad0..3a358fab 100644
--- a/contrib/10.regexp/src/regexp.c
+++ b/contrib/10.regexp/src/regexp.c
@@ -54,7 +54,7 @@ pic_regexp_regexp(pic_state *pic)
     }
   }
 
-  reg = pic_alloc(pic, sizeof(struct pic_regexp_t));
+  reg = pic_malloc(pic, sizeof(struct pic_regexp_t));
   reg->flags = flags;
 
   if ((err = regcomp(&reg->reg, ptrn, cflags)) != 0) {
diff --git a/extlib/benz/blob.c b/extlib/benz/blob.c
index 4ca4006d..0169c970 100644
--- a/extlib/benz/blob.c
+++ b/extlib/benz/blob.c
@@ -12,7 +12,7 @@ pic_make_blob(pic_state *pic, size_t len)
   struct pic_blob *bv;
 
   bv = (struct pic_blob *)pic_obj_alloc(pic, sizeof(struct pic_blob), PIC_TT_BLOB);
-  bv->data = pic_alloc(pic, len);
+  bv->data = pic_malloc(pic, len);
   bv->len = len;
   return bv;
 }
diff --git a/extlib/benz/codegen.c b/extlib/benz/codegen.c
index c90e0aab..bd9fe03b 100644
--- a/extlib/benz/codegen.c
+++ b/extlib/benz/codegen.c
@@ -70,7 +70,7 @@ new_analyze_state(pic_state *pic)
   pic_sym *sym;
   xh_entry *it;
 
-  state = pic_alloc(pic, sizeof(analyze_state));
+  state = pic_malloc(pic, sizeof(analyze_state));
   state->pic = pic;
   state->scope = NULL;
 
@@ -144,7 +144,7 @@ static bool
 push_scope(analyze_state *state, pic_value formals)
 {
   pic_state *pic = state->pic;
-  analyze_scope *scope = pic_alloc(pic, sizeof(analyze_scope));
+  analyze_scope *scope = pic_malloc(pic, sizeof(analyze_scope));
   bool varg;
 
   xv_init(scope->args);
@@ -900,7 +900,7 @@ new_codegen_state(pic_state *pic)
 {
   codegen_state *state;
 
-  state = pic_alloc(pic, sizeof(codegen_state));
+  state = pic_malloc(pic, sizeof(codegen_state));
   state->pic = pic;
   state->cxt = NULL;
 
@@ -1026,7 +1026,7 @@ push_codegen_context(codegen_state *state, pic_value name, pic_value args, pic_v
 
   assert(pic_sym_p(name) || pic_false_p(name));
 
-  cxt = pic_alloc(pic, sizeof(codegen_context));
+  cxt = pic_malloc(pic, sizeof(codegen_context));
   cxt->up = state->cxt;
   cxt->name = pic_false_p(name)
     ? pic_intern_cstr(pic, "(anonymous lambda)")
diff --git a/extlib/benz/cont.c b/extlib/benz/cont.c
index eaa09771..00209c0c 100644
--- a/extlib/benz/cont.c
+++ b/extlib/benz/cont.c
@@ -36,7 +36,7 @@ pic_dynamic_wind(pic_state *pic, struct pic_proc *in, struct pic_proc *thunk, st
   }
 
   here = pic->wind;
-  pic->wind = pic_alloc(pic, sizeof(struct pic_winder));
+  pic->wind = pic_malloc(pic, sizeof(struct pic_winder));
   pic->wind->prev = here;
   pic->wind->depth = here->depth + 1;
   pic->wind->in = in;
@@ -128,7 +128,7 @@ pic_make_econt(pic_state *pic, struct pic_escape *escape)
 pic_value
 pic_escape(pic_state *pic, struct pic_proc *proc)
 {
-  struct pic_escape *escape = pic_alloc(pic, sizeof(struct pic_escape));
+  struct pic_escape *escape = pic_malloc(pic, sizeof(struct pic_escape));
 
   pic_save_point(pic, escape);
 
diff --git a/extlib/benz/dict.c b/extlib/benz/dict.c
index 4312c40f..0ad6f769 100644
--- a/extlib/benz/dict.c
+++ b/extlib/benz/dict.c
@@ -170,7 +170,7 @@ pic_dict_dictionary_map(pic_state *pic)
 
   pic_get_args(pic, "l*", &proc, &argc, &args);
 
-  it = pic_alloc(pic, argc * sizeof(xh_entry));
+  it = pic_malloc(pic, argc * sizeof(xh_entry));
   for (i = 0; i < argc; ++i) {
     if (! pic_dict_p(args[i])) {
       pic_free(pic, it);
@@ -217,7 +217,7 @@ pic_dict_dictionary_for_each(pic_state *pic)
 
   pic_get_args(pic, "l*", &proc, &argc, &args);
 
-  it = pic_alloc(pic, argc * sizeof(xh_entry));
+  it = pic_malloc(pic, argc * sizeof(xh_entry));
   for (i = 0; i < argc; ++i) {
     if (! pic_dict_p(args[i])) {
       pic_free(pic, it);
diff --git a/extlib/benz/gc.c b/extlib/benz/gc.c
index 348a64f0..0fea8df1 100644
--- a/extlib/benz/gc.c
+++ b/extlib/benz/gc.c
@@ -104,7 +104,7 @@ add_heap_page(pic_state *pic)
   up->s.size = 1;
   up->s.ptr = np;
 
-  page = pic_alloc(pic, sizeof(struct heap_page));
+  page = pic_malloc(pic, sizeof(struct heap_page));
   page->basep = up;
   page->endp = up + nu + 1;
   page->next = pic->heap->pages;
@@ -131,7 +131,7 @@ pic_default_allocf(void *ptr, size_t size)
 #endif
 
 void *
-pic_alloc(pic_state *pic, size_t size)
+pic_malloc(pic_state *pic, size_t size)
 {
   void *ptr;
 
diff --git a/extlib/benz/include/picrin.h b/extlib/benz/include/picrin.h
index 37bd8312..2a75d496 100644
--- a/extlib/benz/include/picrin.h
+++ b/extlib/benz/include/picrin.h
@@ -151,8 +151,7 @@ typedef struct {
 
 typedef pic_value (*pic_func_t)(pic_state *);
 
-void *pic_alloc(pic_state *, size_t);
-#define pic_malloc(pic,size) pic_alloc(pic,size) /* obsoleted */
+void *pic_malloc(pic_state *, size_t);
 void *pic_realloc(pic_state *, void *, size_t);
 void *pic_calloc(pic_state *, size_t, size_t);
 struct pic_object *pic_obj_alloc(pic_state *, size_t, enum pic_tt);
diff --git a/extlib/benz/include/picrin/error.h b/extlib/benz/include/picrin/error.h
index 7f58ec35..efb12130 100644
--- a/extlib/benz/include/picrin/error.h
+++ b/extlib/benz/include/picrin/error.h
@@ -32,7 +32,7 @@ struct pic_error *pic_make_error(pic_state *, pic_sym *, const char *, pic_list)
   pic_catch_(PIC_GENSYM(label))
 #define pic_try_(escape)                                                \
   do {                                                                  \
-    struct pic_escape *escape = pic_alloc(pic, sizeof(struct pic_escape)); \
+    struct pic_escape *escape = pic_malloc(pic, sizeof(struct pic_escape)); \
     pic_save_point(pic, escape);                                        \
     if (PIC_SETJMP(pic, (void *)escape->jmp) == 0) {                    \
       pic_push_try(pic, escape);                                        \
diff --git a/extlib/benz/port.c b/extlib/benz/port.c
index 65e6482c..df6a971c 100644
--- a/extlib/benz/port.c
+++ b/extlib/benz/port.c
@@ -197,7 +197,7 @@ pic_get_output_string(pic_state *pic, struct pic_port *port)
   xrewind(port->file);
 
   /* copy to buf */
-  buf = (char *)pic_alloc(pic, size + 1);
+  buf = (char *)pic_malloc(pic, size + 1);
   buf[size] = 0;
   xfread(buf, size, 1, port->file);
 
diff --git a/extlib/benz/read.c b/extlib/benz/read.c
index 4f6c6b30..f0d0299f 100644
--- a/extlib/benz/read.c
+++ b/extlib/benz/read.c
@@ -208,7 +208,7 @@ read_symbol(pic_state *pic, struct pic_port *port, int c)
   pic_sym *sym;
 
   len = 1;
-  buf = pic_alloc(pic, len + 1);
+  buf = pic_malloc(pic, len + 1);
   buf[0] = case_fold(pic, c);
   buf[1] = 0;
 
@@ -468,7 +468,7 @@ read_string(pic_state *pic, struct pic_port *port, int c)
   pic_str *str;
 
   size = 256;
-  buf = pic_alloc(pic, size);
+  buf = pic_malloc(pic, size);
   cnt = 0;
 
   /* TODO: intraline whitespaces */
@@ -506,7 +506,7 @@ read_pipe(pic_state *pic, struct pic_port *port, int c)
   size_t i = 0;
 
   size = 256;
-  buf = pic_alloc(pic, size);
+  buf = pic_malloc(pic, size);
   cnt = 0;
   while ((c = next(port)) != '|') {
     if (c == '\\') {
@@ -830,7 +830,7 @@ pic_reader_open(pic_state *pic)
   struct pic_reader *reader;
   int c;
 
-  reader = pic_alloc(pic, sizeof(struct pic_reader));
+  reader = pic_malloc(pic, sizeof(struct pic_reader));
   reader->typecase = PIC_CASE_DEFAULT;
   xh_init_int(&reader->labels, sizeof(pic_value));
 
diff --git a/extlib/benz/state.c b/extlib/benz/state.c
index 5e574d53..efc8d2a8 100644
--- a/extlib/benz/state.c
+++ b/extlib/benz/state.c
@@ -318,7 +318,7 @@ pic_open(int argc, char *argv[], char **envp, pic_allocf allocf)
   pic->macros = pic_make_dict(pic);
 
   /* root block */
-  pic->wind = pic_alloc(pic, sizeof(struct pic_winder));
+  pic->wind = pic_malloc(pic, sizeof(struct pic_winder));
   pic->wind->prev = NULL;
   pic->wind->depth = 0;
   pic->wind->in = pic->wind->out = NULL;
diff --git a/extlib/benz/string.c b/extlib/benz/string.c
index aeafef93..c9b75bd0 100644
--- a/extlib/benz/string.c
+++ b/extlib/benz/string.c
@@ -465,7 +465,7 @@ pic_str_string(pic_state *pic)
 
   pic_get_args(pic, "*", &argc, &argv);
 
-  buf = pic_alloc(pic, (size_t)argc);
+  buf = pic_malloc(pic, (size_t)argc);
 
   for (i = 0; i < argc; ++i) {
     pic_assert_type(pic, argv[i], char);
diff --git a/extlib/benz/vector.c b/extlib/benz/vector.c
index f98c81ab..46b02616 100644
--- a/extlib/benz/vector.c
+++ b/extlib/benz/vector.c
@@ -15,7 +15,7 @@ pic_make_vec(pic_state *pic, size_t len)
 
   vec = (struct pic_vector *)pic_obj_alloc(pic, sizeof(struct pic_vector), PIC_TT_VECTOR);
   vec->len = len;
-  vec->data = (pic_value *)pic_alloc(pic, sizeof(pic_value) * len);
+  vec->data = (pic_value *)pic_malloc(pic, sizeof(pic_value) * len);
   for (i = 0; i < len; ++i) {
     vec->data[i] = pic_none_value();
   }
@@ -363,7 +363,7 @@ pic_vec_vector_to_string(pic_state *pic)
     pic_errorf(pic, "vector->string: end index must not be less than start index");
   }
 
-  buf = pic_alloc(pic, end - start);
+  buf = pic_malloc(pic, end - start);
 
   for (i = start; i < end; ++i) {
     pic_assert_type(pic, vec->data[i], char);