diff --git a/Cocoa/GBView.m b/Cocoa/GBView.m
index 7f87901..5a851f3 100644
--- a/Cocoa/GBView.m
+++ b/Cocoa/GBView.m
@@ -148,11 +148,11 @@
 - (void) flip
 {
     if (underclockKeyDown && clockMultiplier > 0.5) {
-        clockMultiplier -= 0.1;
+        clockMultiplier -= 1.0/16;
         GB_set_clock_multiplier(_gb, clockMultiplier);
     }
     if (!underclockKeyDown && clockMultiplier < 1.0) {
-        clockMultiplier += 0.1;
+        clockMultiplier += 1.0/16;
         GB_set_clock_multiplier(_gb, clockMultiplier);
     }
     current_buffer = (current_buffer + 1) % self.numberOfBuffers;
diff --git a/SDL/main.c b/SDL/main.c
index c0a0585..9dbea9b 100755
--- a/SDL/main.c
+++ b/SDL/main.c
@@ -318,11 +318,11 @@ static void handle_events(GB_gameboy_t *gb)
 static void vblank(GB_gameboy_t *gb)
 {
     if (underclock_down && clock_mutliplier > 0.5) {
-        clock_mutliplier -= 0.1;
+        clock_mutliplier -= 1.0/16;
         GB_set_clock_multiplier(gb, clock_mutliplier);
     }
     else if (!underclock_down && clock_mutliplier < 1.0) {
-        clock_mutliplier += 0.1;
+        clock_mutliplier += 1.0/16;
         GB_set_clock_multiplier(gb, clock_mutliplier);
     }
     if (configuration.blend_frames) {