diff --git a/include/sys/param.h b/include/sys/param.h
index 60f3ae2a97..5a19949602 100644
--- a/include/sys/param.h
+++ b/include/sys/param.h
@@ -31,6 +31,6 @@
 #define ptob(pages)			(pages << PAGE_SHIFT)
 #define btop(bytes)			(bytes >> PAGE_SHIFT)
 
-#define MAXUID				2147483647
+#define MAXUID				UINT32_MAX
 
 #endif /* SPL_PARAM_H */