diff --git a/servers/vm/sanitycheck.h b/servers/vm/sanitycheck.h
index 30125f4e1..60c8a1eb6 100644
--- a/servers/vm/sanitycheck.h
+++ b/servers/vm/sanitycheck.h
@@ -42,7 +42,7 @@
 }
 
 #else
-#define SANITYCHECK  (void)
+#define SANITYCHECK(l)
 #define SLABSANITYCHECK(l)
 #define SLABSANE(ptr)
 #endif