diff --git a/winsup/mingw/ChangeLog b/winsup/mingw/ChangeLog
index 08cc01898..4cd26f928 100644
--- a/winsup/mingw/ChangeLog
+++ b/winsup/mingw/ChangeLog
@@ -1,3 +1,7 @@
+2009-07-23  Jacky Lai  <crazyjacky@users.sourceforge.net>
+
+	* mingwex/math/fminf.c: switch to using __isnanf() as opposed to _isnan().
+
 2009-07-18  Gregory McGarry  <gregorymcgarry@users.sourceforge.net>
 
 	* include/inttypes.h include/math.h include/stdio.h include/stdlib.h
diff --git a/winsup/mingw/mingwex/math/fminf.c b/winsup/mingw/mingwex/math/fminf.c
index f3d71480d..4b974ba01 100644
--- a/winsup/mingw/mingwex/math/fminf.c
+++ b/winsup/mingw/mingwex/math/fminf.c
@@ -3,5 +3,5 @@
 float
 fminf (float _x, float _y)
 {
-  return ((islessequal(_x, _y) || _isnan (_y)) ? _x : _y );
+  return ((islessequal(_x, _y) || __isnanf (_y)) ? _x : _y );
 }