diff --git a/Alc/mixer.c b/Alc/mixer.c
index d6dac3b5..09a87ca7 100644
--- a/Alc/mixer.c
+++ b/Alc/mixer.c
@@ -217,7 +217,7 @@ static inline double CalcKaiserBeta(double rejection)
 static float SincKaiser(double r, double x)
 {
     /* Limit rippling to -60dB. */
-    return Kaiser(CalcKaiserBeta(60.0), x / r) * Sinc(x);
+    return (float)(Kaiser(CalcKaiserBeta(60.0), x / r) * Sinc(x));
 }