diff --git a/libsrc/c65/_scrsize.s b/libsrc/c65/_scrsize.s
index 57ad4f30f..3fc955657 100644
--- a/libsrc/c65/_scrsize.s
+++ b/libsrc/c65/_scrsize.s
@@ -5,8 +5,13 @@
 ;
 
         .export         screensize
-        .import         SCREEN
+        .include        "cbm_kernal.inc"
 
-screensize      = SCREEN
+.proc   screensize
 
+        jsr     SCREEN
+        inx
+        iny
+        rts
 
+.endproc
diff --git a/libsrc/mega65/_scrsize.s b/libsrc/mega65/_scrsize.s
index 57ad4f30f..3fc955657 100644
--- a/libsrc/mega65/_scrsize.s
+++ b/libsrc/mega65/_scrsize.s
@@ -5,8 +5,13 @@
 ;
 
         .export         screensize
-        .import         SCREEN
+        .include        "cbm_kernal.inc"
 
-screensize      = SCREEN
+.proc   screensize
 
+        jsr     SCREEN
+        inx
+        iny
+        rts
 
+.endproc