diff --git a/celt/mathops.h b/celt/mathops.h
index fe29dac1c21df3ba060a0067700a9471a8acadfd..478ac9187c6f555cd3a8c67abf70999e4805126b 100644
--- a/celt/mathops.h
+++ b/celt/mathops.h
@@ -153,7 +153,7 @@ static OPUS_INLINE float celt_exp2(float x)
       float f;
       opus_uint32 i;
    } res;
-   integer = floor(x);
+   integer = (int)floor(x);
    if (integer < -50)
       return 0;
    frac = x-integer;