diff --git a/winsup/mingw/ChangeLog b/winsup/mingw/ChangeLog
index 33dcf9715..4c5de35c8 100644
--- a/winsup/mingw/ChangeLog
+++ b/winsup/mingw/ChangeLog
@@ -1,3 +1,7 @@
+2011-05-22  Antoine LECA  <antoinel@users.sourceforge.net>
+
+	* mingwex/isblank.c:  Fix typo in declaration.
+
 2011-05-22  Antoine LECA  <antoinel@users.sourceforge.net>
 
 	* include/_mingw.h:  Define GCC system_header only if PCC is not defined.
diff --git a/winsup/mingw/mingwex/isblank.c b/winsup/mingw/mingwex/isblank.c
index d3ba74d39..1dc1246d2 100755
--- a/winsup/mingw/mingwex/isblank.c
+++ b/winsup/mingw/mingwex/isblank.c
@@ -1,5 +1,5 @@
 #define __NO_CTYPE_LINES
 #include <ctype.h>
 
-int _cdecl isblank (int c)
+int __cdecl isblank (int c)
 {return (_isctype(c, _BLANK) || c == '\t');}