diff --git a/src/ld65/cfg/module.cfg b/src/ld65/cfg/module.cfg
index 7d30d0e37..edc87fb17 100644
--- a/src/ld65/cfg/module.cfg
+++ b/src/ld65/cfg/module.cfg
@@ -1,5 +1,5 @@
 MEMORY {
-    ZP:       file = "", start = $0000, size = $0100, type = rw, define = yes;
+    ZP:       file = %O, start = $0000, size = $0100, type = rw, define = yes;
     COMBINED: file = %O, start = $0000, size = $FFFF;
 }
 SEGMENTS {