diff --git a/libsrc/apple2/extra/iobuf-0800.s b/libsrc/apple2/extra/iobuf-0800.s
index 017bc030e..c46052ca8 100644
--- a/libsrc/apple2/extra/iobuf-0800.s
+++ b/libsrc/apple2/extra/iobuf-0800.s
@@ -12,7 +12,7 @@
 
         .include	"zeropage.inc"
         .include	"errno.inc"
-        .include	"filedes.inc"
+        .include	"../filedes.inc"
 
         .segment	"INIT"