diff --git a/libsrc/c16/fast.s b/libsrc/c16/fast.s
index e48813969..50924edbc 100644
--- a/libsrc/c16/fast.s
+++ b/libsrc/c16/fast.s
@@ -1,22 +1 @@
-;
-; Marco van den Heuvel, 2018-03-20
-;
-; void fast (void);
-; /* Switch the CPU into double clock mode. */
-;
-
-        .export         _fast
-
-        .include        "plus4.inc"
-
-
-.proc   _fast
-
-        lda     TED_CLK
-        and     #%11111101
-        sta     TED_CLK
-        rts
-
-.endproc
-
-
+.include "../plus4/fast.s"