diff --git a/reactos/include/reactos/win32k/ntgdityp.h b/reactos/include/reactos/win32k/ntgdityp.h
index 550247aaa16..20872ad644e 100644
--- a/reactos/include/reactos/win32k/ntgdityp.h
+++ b/reactos/include/reactos/win32k/ntgdityp.h
@@ -143,4 +143,12 @@ typedef struct _MATRIX_S
     FLONG flAccel;
 } MATRIX_S;
 
+/* Gdi XForm storage union */
+typedef union
+{
+  FLOAT f;
+  ULONG l;
+} gxf_long;
+
+
 #endif