diff --git a/tests/MathTest.cpp b/tests/MathTest.cpp
index 756c68c..1539cd7 100644
--- a/tests/MathTest.cpp
+++ b/tests/MathTest.cpp
@@ -22,7 +22,7 @@
             for (int a = 0; a <= 255; a++) {
                 int r0 = SkAlphaBlend255(src, dst, a);
                 float f1 = float_blend(src, dst, a / 255.f);
-                int r1 = SkScalarRoundToInt(f1);
+                int r1 = SkScalarRoundToInt(SkFloatToScalar(f1));
 
                 if (r0 != r1) {
                     float diff = sk_float_abs(f1 - r1);