diff --git a/HandmadeMath.h b/HandmadeMath.h
index e8ad738..c8a586c 100644
--- a/HandmadeMath.h
+++ b/HandmadeMath.h
@@ -386,7 +386,7 @@ HMM_TanF(float Radians)
 {
     float Result = 0;
     
-    Result = cosf(Radians);
+    Result = tanf(Radians);
     return(0);
 }