diff --git a/gobject/gparam.c b/gobject/gparam.c
index 472ea3d47..f50793ae5 100644
--- a/gobject/gparam.c
+++ b/gobject/gparam.c
@@ -51,7 +51,7 @@
 
 /* --- defines --- */
 #define PARAM_FLOATING_FLAG                     0x2
-#define	G_PARAM_USER_MASK			(~0 << G_PARAM_USER_SHIFT)
+#define	G_PARAM_USER_MASK			(~0U << G_PARAM_USER_SHIFT)
 #define PSPEC_APPLIES_TO_VALUE(pspec, value)	(G_TYPE_CHECK_VALUE_TYPE ((value), G_PARAM_SPEC_VALUE_TYPE (pspec)))
 
 /* --- prototypes --- */