diff --git a/ChangeLog b/ChangeLog
index d887edd323..66c2ec73f3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jan 24 19:34:23 2016  Eric Wong  <e@80x24.org>
+
+	* vm_insnhelper.c (vm_check_if_namespace): tiny size reduction
+
 Sun Jan 24 18:12:36 2016  Martin Duerst  <duerst@it.aoyama.ac.jp>
 
 	* common.mk: Simplifying Unicode data file download logic to make
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 86f6c4b2be..022a64df12 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -643,11 +643,8 @@ vm_get_const_base(const VALUE *ep)
 static inline void
 vm_check_if_namespace(VALUE klass)
 {
-    VALUE str;
     if (!RB_TYPE_P(klass, T_CLASS) && !RB_TYPE_P(klass, T_MODULE)) {
-	str = rb_inspect(klass);
-	rb_raise(rb_eTypeError, "%s is not a class/module",
-		 StringValuePtr(str));
+	rb_raise(rb_eTypeError, "%+"PRIsVALUE" is not a class/module", klass);
     }
 }