diff --git a/src/init.c b/src/init.c
index b11bd0d7..07fac1e3 100644
--- a/src/init.c
+++ b/src/init.c
@@ -32,6 +32,7 @@ void pic_init_write(pic_state *);
 void pic_init_read(pic_state *);
 void pic_init_dict(pic_state *);
 void pic_init_eval(pic_state *);
+void pic_init_lib(pic_state *);
 void pic_init_contrib(pic_state *);
 
 void pic_load_piclib(pic_state *);
@@ -94,6 +95,7 @@ pic_init_core(pic_state *pic)
     pic_init_read(pic); DONE;
     pic_init_dict(pic); DONE;
     pic_init_eval(pic); DONE;
+    pic_init_lib(pic); DONE;
 
     pic_load_piclib(pic); DONE;
 
diff --git a/src/lib.c b/src/lib.c
index 7a197c87..9061afbc 100644
--- a/src/lib.c
+++ b/src/lib.c
@@ -6,6 +6,7 @@
 #include "picrin/lib.h"
 #include "picrin/pair.h"
 #include "picrin/macro.h"
+#include "picrin/error.h"
 
 struct pic_lib *
 pic_make_library(pic_state *pic, pic_value name)
@@ -113,3 +114,41 @@ pic_export_as(pic_state *pic, pic_sym sym, pic_sym as)
 
   xh_put_int(&pic->lib->exports, as, &rename);
 }
+
+static pic_value
+pic_lib_define_library(pic_state *pic)
+{
+  struct pic_lib *prev = pic->lib;
+  size_t argc, i;
+  pic_value spec, *argv;
+
+  pic_get_args(pic, "o*", &spec, &argc, &argv);
+
+  pic_make_library(pic, spec);
+
+  pic_try {
+    pic_in_library(pic, spec);
+
+    for (i = 0; i < argc; ++i) {
+      pic_void(pic_eval(pic, argv[i], pic->lib));
+    }
+
+    pic_in_library(pic, prev->name);
+  }
+  pic_catch {
+    pic_in_library(pic, prev->name); /* restores pic->lib even if an error occurs */
+    pic_throw_error(pic, pic->err);
+  }
+
+  return pic_none_value();
+}
+
+void
+pic_init_lib(pic_state *pic)
+{
+  void pic_defmacro(pic_state *, pic_sym, pic_sym, pic_func_t);
+
+  /* pic_define_library_syntax(pic, "import", pic_lib_import); */
+  /* pic_define_library_syntax(pic, "export", pic_lib_export); */
+  pic_defmacro(pic, pic->sDEFINE_LIBRARY, pic->rDEFINE_LIBRARY, pic_lib_define_library);
+}
diff --git a/src/macro.c b/src/macro.c
index 0603d232..191df9a0 100644
--- a/src/macro.c
+++ b/src/macro.c
@@ -152,35 +152,6 @@ macroexpand_export(pic_state *pic, pic_value expr)
   return pic_none_value();
 }
 
-static pic_value
-macroexpand_deflibrary(pic_state *pic, pic_value expr)
-{
-  struct pic_lib *prev = pic->lib;
-  pic_value v;
-
-  if (pic_length(pic, expr) < 2) {
-    pic_error(pic, "syntax error");
-  }
-
-  pic_make_library(pic, pic_cadr(pic, expr));
-
-  pic_try {
-    pic_in_library(pic, pic_cadr(pic, expr));
-
-    pic_for_each (v, pic_cddr(pic, expr)) {
-      pic_void(pic_eval(pic, v, pic->lib));
-    }
-
-    pic_in_library(pic, prev->name);
-  }
-  pic_catch {
-    pic_in_library(pic, prev->name); /* restores pic->lib even if an error occurs */
-    pic_throw_error(pic, pic->err);
-  }
-
-  return pic_none_value();
-}
-
 static pic_value
 macroexpand_list(pic_state *pic, pic_value obj, struct pic_senv *senv)
 {
@@ -359,10 +330,7 @@ macroexpand_node(pic_state *pic, pic_value expr, struct pic_senv *senv)
     if (pic_sym_p(car)) {
       pic_sym tag = pic_sym(car);
 
-      if (tag == pic->rDEFINE_LIBRARY) {
-        return macroexpand_deflibrary(pic, expr);
-      }
-      else if (tag == pic->rIMPORT) {
+      if (tag == pic->rIMPORT) {
         return macroexpand_import(pic, expr);
       }
       else if (tag == pic->rEXPORT) {
@@ -519,17 +487,15 @@ pic_define_syntactic_keyword(pic_state *pic, struct pic_senv *senv, pic_sym sym,
 }
 
 void
-pic_defmacro(pic_state *pic, const char *name, struct pic_proc *macro)
+pic_defmacro(pic_state *pic, pic_sym name, pic_sym id, pic_func_t func)
 {
-  pic_sym sym, rename;
+  pic_put_rename(pic, pic->lib->env, name, id);
 
   /* symbol registration */
-  sym = pic_intern_cstr(pic, name);
-  rename = pic_add_rename(pic, pic->lib->env, sym);
-  define_macro(pic, rename, macro, NULL);
+  define_macro(pic, id, pic_proc_new(pic, func, pic_symbol_name(pic, name)), NULL);
 
   /* auto export! */
-  pic_export(pic, sym);
+  pic_export(pic, name);
 }
 
 bool