diff --git a/libsrc/c16/revers.s b/libsrc/c16/revers.s
index f1c0b4d64..3ce668760 100644
--- a/libsrc/c16/revers.s
+++ b/libsrc/c16/revers.s
@@ -1,27 +1 @@
-;
-; Ullrich von Bassewitz, 07.08.1998
-;
-; unsigned char revers (unsigned char onoff);
-;
-
-        .export         _revers
-
-        .include        "plus4.inc"
-
-.proc   _revers
-
-        ldx     #$00            ; Assume revers off
-        tay                     ; Test onoff
-        beq     L1              ; Jump if off
-        ldx     #$80            ; Load on value
-        ldy     #$00            ; Assume old value is zero
-L1:     lda     RVS             ; Load old value
-        stx     RVS             ; Set new value
-        beq     L2              ; Jump if old value zero
-        iny                     ; Make old value = 1
-L2:     ldx     #$00            ; Load high byte of result
-        tya                     ; Load low byte, set CC
-        rts
-
-.endproc
-
+.include "../plus4/revers.s"