diff --git a/Headers/gnustep/gui/NSTextStorage.h b/Headers/gnustep/gui/NSTextStorage.h
index 4e963a94d..e31599a21 100644
--- a/Headers/gnustep/gui/NSTextStorage.h
+++ b/Headers/gnustep/gui/NSTextStorage.h
@@ -33,6 +33,7 @@
 
 #include <Foundation/Foundation.h>
 #include <AppKit/NSStringDrawing.h>
+#include <AppKit/AppKitDefines.h>
 
 @class NSLayoutManager;