diff --git a/lib/oscillator.c b/lib/oscillator.c
index a704196..47fd3cb 100644
--- a/lib/oscillator.c
+++ b/lib/oscillator.c
@@ -32,5 +32,5 @@ float get_oscillator_sin_multiplier_ni(Oscillator *osc, float multiplier) {
     return sinf(osc->phase*multiplier);
 }
 float get_oscillator_cos_multiplier_ni(Oscillator *osc, float multiplier) {
-    return sinf(osc->phase*multiplier);
+    return cosf(osc->phase*multiplier);
 }
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