diff --git a/ChangeLog b/ChangeLog
index f4586d2ab7..fe1749ea8f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun May 16 13:55:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* error.c (rb_loaderror): use locale string, not ascii-8bit.
+
 Sun May 16 11:39:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/missing.h (signbit): add missing prototype.
diff --git a/common.mk b/common.mk
index bfa9083eb2..0d47e58259 100644
--- a/common.mk
+++ b/common.mk
@@ -540,7 +540,8 @@ enum.$(OBJEXT): {$(VPATH)}enum.c $(RUBY_H_INCLUDES) {$(VPATH)}node.h \
   {$(VPATH)}util.h
 enumerator.$(OBJEXT): {$(VPATH)}enumerator.c $(RUBY_H_INCLUDES)
 error.$(OBJEXT): {$(VPATH)}error.c {$(VPATH)}known_errors.inc \
-  $(RUBY_H_INCLUDES) $(VM_CORE_H_INCLUDES) {$(VPATH)}debug.h
+  $(RUBY_H_INCLUDES) $(VM_CORE_H_INCLUDES) $(ENCODING_H_INCLUDES) \
+  {$(VPATH)}debug.h
 eval.$(OBJEXT): {$(VPATH)}eval.c {$(VPATH)}eval_intern.h {$(VPATH)}vm.h \
   $(RUBY_H_INCLUDES) $(VM_CORE_H_INCLUDES) {$(VPATH)}eval_error.c \
   {$(VPATH)}eval_jump.c {$(VPATH)}debug.h {$(VPATH)}gc.h {$(VPATH)}iseq.h
diff --git a/error.c b/error.c
index 39bec9ede4..fb2aa8d7df 100644
--- a/error.c
+++ b/error.c
@@ -11,6 +11,7 @@
 
 #include "ruby/ruby.h"
 #include "ruby/st.h"
+#include "ruby/encoding.h"
 #include "vm_core.h"
 
 #include <stdio.h>
@@ -1469,7 +1470,7 @@ rb_loaderror(const char *fmt, ...)
     VALUE mesg;
 
     va_start(args, fmt);
-    mesg = rb_vsprintf(fmt, args);
+    mesg = rb_enc_vsprintf(rb_locale_encoding(), fmt, args);
     va_end(args);
     rb_exc_raise(rb_exc_new3(rb_eLoadError, mesg));
 }