diff --git a/libsrc/c64/tgi/c64-hi.s b/libsrc/c64/tgi/c64-hi.s
index e2c3bca9f..8543345a5 100644
--- a/libsrc/c64/tgi/c64-hi.s
+++ b/libsrc/c64/tgi/c64-hi.s
@@ -541,8 +541,7 @@ STEPINY:
         eor     CHUNK
         sta     CHUNK
         txa
-        bne     @CONT        ;If dy=0 it's just a point
-        inx
+        beq     YCONT2       ;If dy=0, it's just a point
 @CONT:  lsr                  ;Init counter to dy/2
 ;
 ; Main loop