diff --git a/include/picrin.h b/include/picrin.h
index 29640fa7..ae6f66ef 100644
--- a/include/picrin.h
+++ b/include/picrin.h
@@ -175,9 +175,9 @@ pic_value pic_apply3(pic_state *, struct pic_proc *, pic_value, pic_value, pic_v
 pic_value pic_apply4(pic_state *, struct pic_proc *, pic_value, pic_value, pic_value, pic_value);
 pic_value pic_apply5(pic_state *, struct pic_proc *, pic_value, pic_value, pic_value, pic_value, pic_value);
 pic_value pic_apply_trampoline(pic_state *, struct pic_proc *, pic_value);
-pic_value pic_eval(pic_state *, pic_value);
-struct pic_proc *pic_compile(pic_state *, pic_value);
-pic_value pic_macroexpand(pic_state *, pic_value);
+pic_value pic_eval(pic_state *, pic_value, struct pic_lib *);
+struct pic_proc *pic_compile(pic_state *, pic_value, struct pic_lib *);
+pic_value pic_macroexpand(pic_state *, pic_value, struct pic_lib *);
 
 void pic_in_library(pic_state *, pic_value);
 struct pic_lib *pic_make_library(pic_state *, pic_value);
diff --git a/src/codegen.c b/src/codegen.c
index 8f8d9aed..1dc7e898 100644
--- a/src/codegen.c
+++ b/src/codegen.c
@@ -1442,7 +1442,7 @@ pic_codegen(pic_state *pic, pic_value obj)
 }
 
 struct pic_proc *
-pic_compile(pic_state *pic, pic_value obj)
+pic_compile(pic_state *pic, pic_value obj, struct pic_lib *lib)
 {
   struct pic_irep *irep;
   size_t ai = pic_gc_arena_preserve(pic);
@@ -1458,7 +1458,7 @@ pic_compile(pic_state *pic, pic_value obj)
 #endif
 
   /* macroexpand */
-  obj = pic_macroexpand(pic, obj);
+  obj = pic_macroexpand(pic, obj, lib);
 #if DEBUG
   fprintf(stdout, "## macroexpand completed\n");
   pic_debug(pic, obj);
diff --git a/src/load.c b/src/load.c
index f4b4db73..269fc657 100644
--- a/src/load.c
+++ b/src/load.c
@@ -20,7 +20,7 @@ pic_load_cstr(pic_state *pic, const char *src)
   pic_for_each (v, exprs) {
     ai = pic_gc_arena_preserve(pic);
 
-    proc = pic_compile(pic, v);
+    proc = pic_compile(pic, v, pic->lib);
     if (proc == NULL) {
       pic_error(pic, "load: compilation failure");
     }
@@ -54,7 +54,7 @@ pic_load(pic_state *pic, const char *fn)
   pic_for_each (v, exprs) {
     ai = pic_gc_arena_preserve(pic);
 
-    proc = pic_compile(pic, v);
+    proc = pic_compile(pic, v, pic->lib);
     if (proc == NULL) {
       pic_error(pic, "load: compilation failure");
     }
diff --git a/src/macro.c b/src/macro.c
index 875e7d3f..40167238 100644
--- a/src/macro.c
+++ b/src/macro.c
@@ -168,7 +168,7 @@ macroexpand_deflibrary(pic_state *pic, pic_value expr)
     pic_in_library(pic, pic_cadr(pic, expr));
 
     pic_for_each (v, pic_cddr(pic, expr)) {
-      pic_void(pic_eval(pic, v));
+      pic_void(pic_eval(pic, v, pic->lib));
     }
 
     pic_in_library(pic, prev->name);
@@ -293,7 +293,7 @@ macroexpand_defsyntax(pic_state *pic, pic_value expr, struct pic_senv *senv)
   val = pic_cadr(pic, pic_cdr(pic, expr));
 
   pic_try {
-    val = pic_eval(pic, val);
+    val = pic_eval(pic, val, pic->lib);
   } pic_catch {
     pic_errorf(pic, "macroexpand error while definition: %s", pic_errmsg(pic));
   }
@@ -413,8 +413,9 @@ macroexpand(pic_state *pic, pic_value expr, struct pic_senv *senv)
 }
 
 pic_value
-pic_macroexpand(pic_state *pic, pic_value expr)
+pic_macroexpand(pic_state *pic, pic_value expr, struct pic_lib *lib)
 {
+  struct pic_lib *prev;
   pic_value v;
 
 #if DEBUG
@@ -423,7 +424,13 @@ pic_macroexpand(pic_state *pic, pic_value expr)
   puts("");
 #endif
 
-  v = macroexpand(pic, expr, pic->lib->env);
+  /* change library for macro-expansion time processing */
+  prev = pic->lib;
+  pic->lib = lib;
+
+  v = macroexpand(pic, expr, lib->env);
+
+  pic->lib = prev;
 
 #if DEBUG
   puts("after expand:");
@@ -560,7 +567,7 @@ pic_macro_macroexpand(pic_state *pic)
 
   pic_get_args(pic, "o", &expr);
 
-  return pic_macroexpand(pic, expr);
+  return pic_macroexpand(pic, expr, pic->lib);
 }
 
 static pic_value
diff --git a/src/vm.c b/src/vm.c
index 2ab80a1e..52af4411 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1063,11 +1063,11 @@ pic_apply_trampoline(pic_state *pic, struct pic_proc *proc, pic_value args)
 }
 
 pic_value
-pic_eval(pic_state *pic, pic_value program)
+pic_eval(pic_state *pic, pic_value program, struct pic_lib *lib)
 {
   struct pic_proc *proc;
 
-  proc = pic_compile(pic, program);
+  proc = pic_compile(pic, program, lib);
 
   return pic_apply(pic, proc, pic_nil_value());
 }
diff --git a/tools/main.c b/tools/main.c
index 5e43f2b7..9771df6e 100644
--- a/tools/main.c
+++ b/tools/main.c
@@ -134,7 +134,7 @@ repl(pic_state *pic)
         pic_for_each (v, exprs) {
 
           /* eval */
-          v = pic_eval(pic, v);
+          v = pic_eval(pic, v, pic->lib);
 
           /* print */
           pic_printf(pic, "=> ~s\n", v);
@@ -185,7 +185,7 @@ exec_file(pic_state *pic, const char *fname)
 
   pic_for_each (v, exprs) {
 
-    proc = pic_compile(pic, v);
+    proc = pic_compile(pic, v, pic->lib);
     if (proc == NULL) {
       fputs(pic_errmsg(pic), stderr);
       fprintf(stderr, "fatal error: %s compilation failure\n", fname);
@@ -223,7 +223,7 @@ exec_string(pic_state *pic, const char *str)
   ai = pic_gc_arena_preserve(pic);
   pic_for_each (v, exprs) {
 
-    proc = pic_compile(pic, v);
+    proc = pic_compile(pic, v, pic->lib);
     if (proc == NULL) {
       goto abort;
     }