diff --git a/ChangeLog b/ChangeLog
index 763a92eb60..1de62d0cae 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Sep 28 22:33:11 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* dln.c (aix_loaderror): needs format string.
+
 Mon Sep 28 19:36:20 2009  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/wini32.c (LK_ERR): with overlapped I/O, LockFileEx() returns
diff --git a/dln.c b/dln.c
index a4250a5119..599ad2eb7f 100644
--- a/dln.c
+++ b/dln.c
@@ -1190,7 +1190,7 @@ aix_loaderror(const char *pathname)
 	ERRBUF_APPEND("\n");
     }
     errbuf[strlen(errbuf)-1] = '\0';	/* trim off last newline */
-    rb_loaderror(errbuf);
+    rb_loaderror("%s", errbuf);
     return;
 }
 #endif