diff --git a/src/gpu/GrBlurUtils.cpp b/src/gpu/GrBlurUtils.cpp
index 4e29461..b79c475 100644
--- a/src/gpu/GrBlurUtils.cpp
+++ b/src/gpu/GrBlurUtils.cpp
@@ -370,7 +370,7 @@
         SkAssertResult(as_MFB(maskFilter)->asABlur(&rec));
 
         builder[5] = rec.fStyle;  // TODO: we could put this with the other style bits
-        builder[6] = rec.fSigma;
+        builder[6] = SkFloat2Bits(rec.fSigma);
         shape->writeUnstyledKey(&builder[7]);
     }