diff --git a/Alc/ALu.c b/Alc/ALu.c
index effa06b4..3d4e37f9 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -966,7 +966,7 @@ ALvoid CalcSourceParams(ALvoice *voice, const ALsource *ALSource, const ALCconte
         /* Normalize the length, and compute panned gains. */
         if(!(Distance > FLT_EPSILON))
         {
-            ALfloat gain = 1.0f / sqrtf(Device->NumSpeakers);
+            ALfloat gain = 1.0f / sqrtf((float)Device->NumSpeakers);
             for(i = 0;i < (ALint)Device->NumSpeakers;i++)
             {
                 enum Channel chan = Device->Speaker[i].ChanName;