diff --git a/SID.play/!RunImage.spin b/SID.play/!RunImage.spin
index 6714f23..2702f96 100644
--- a/SID.play/!RunImage.spin
+++ b/SID.play/!RunImage.spin
@@ -30,7 +30,7 @@ PUB main : t | delta
 
   processSID(string("built-in:0"))
 
-  delta := util.multdiv(clkfreq, 256, trunc(sidcog#C64_CLOCK_FREQ))
+  delta := util.div(clkfreq >> 24, clkfreq << 8, trunc(sidcog#C64_CLOCK_FREQ))
 
   t := cnt
   repeat
@@ -121,4 +121,4 @@ DAT
  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 }}
-DAT
\ No newline at end of file
+DAT