diff --git a/ChangeLog b/ChangeLog
index 168cc31cc5..753aea4d54 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,6 @@
-Thu Jul 31 11:30:42 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Thu Jul 31 11:31:29 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/syck/syck.h (ASSERT): fix typo at r18176.
 
 	* ext/syck/rubyext.c (rb_syck_compile): expression in ASSERT() has no
 	  effect unless debug mode.
diff --git a/ext/syck/syck.h b/ext/syck/syck.h
index 3df3fab3f0..81b3d67952 100644
--- a/ext/syck/syck.h
+++ b/ext/syck/syck.h
@@ -34,7 +34,7 @@ extern "C" {
 #if DEBUG
 void syck_assert( const char *, unsigned, const char * );
 # define ASSERT(f) \
-    (( f ) ? (void)0 syck_assert( __FILE__, __LINE__, #f )
+    (( f ) ? (void)0 : syck_assert( __FILE__, __LINE__, #f ))
 #else
 # define ASSERT(f) ((void)0)
 #endif