diff --git a/lib/memlib.c65 b/lib/memlib.c65
index d2de080..0dbbbe0 100644
--- a/lib/memlib.c65
+++ b/lib/memlib.c65
@@ -53,11 +53,11 @@
 #PRAGMA _P_USE_LONG_JUMP 1
 
 #IFNDEF __LIB_MEM_START
-#DEFINE __LIB_MEM_START = $5000
+#DEFINE __LIB_MEM_START = $$5000
 #IFEND
 
 #IFNDEF __LIB_MEM_END
-#DEFINE __LIB_MEM_END = $9fff
+#DEFINE __LIB_MEM_END = $$9fff
 #IFEND
 
 #IFNDEF NULL