diff --git a/src/synthesizer.rs b/src/synthesizer.rs
index 265c903..dc1594b 100644
--- a/src/synthesizer.rs
+++ b/src/synthesizer.rs
@@ -39,7 +39,8 @@ impl<W: Wavetable> SimpleWavetableSynthesizer<W> {
     pub fn set_freq(&mut self, freq_hz: usize) {
         self.output_freq_hz = freq_hz;
         // probably a better way to do this with modulos or something...
-        self.clock_per_sample = self.clock_freq_hz / self.output_freq_hz / self.wavetable.size();
+        // FIXME: use the length of the square table.. or whatever wavetable tbh
+        self.clock_per_sample = self.clock_freq_hz / self.output_freq_hz / 2;
     }
 
     pub fn tick(&mut self) {