diff --git a/Source/cmGeneratorExpression.h b/Source/cmGeneratorExpression.h
index 5b97e8b2a..d0a6aef5f 100644
--- a/Source/cmGeneratorExpression.h
+++ b/Source/cmGeneratorExpression.h
@@ -16,8 +16,6 @@
 #include "cmStandardIncludes.h"
 #include "cmListFileCache.h"
 
-#include <stack>
-
 #include <cmsys/RegularExpression.hxx>
 #include <cmsys/auto_ptr.hxx>