diff --git a/Headers/gnustep/base/NSData.h b/Headers/gnustep/base/NSData.h
index 2d1998a4a..6022235d0 100644
--- a/Headers/gnustep/base/NSData.h
+++ b/Headers/gnustep/base/NSData.h
@@ -23,6 +23,7 @@
 
 #include <foundation/NSObject.h>
 #include <foundation/NSRange.h>
+#include <foundation/NSSerialization.h>
 
 @interface NSData : NSObject <NSCopying, NSMutableCopying>