diff --git a/runtime/base/histogram-inl.h b/runtime/base/histogram-inl.h
index d572cf9..1a63cf4 100644
--- a/runtime/base/histogram-inl.h
+++ b/runtime/base/histogram-inl.h
@@ -66,7 +66,7 @@
   // dividing the value by the bucket width.
   DCHECK_GE(val, min_);
   DCHECK_LE(val, max_);
-  size_t bucket_idx = static_cast<size_t>((double)(val - min_) / bucket_width_);
+  size_t bucket_idx = static_cast<size_t>(static_cast<double>(val - min_) / bucket_width_);
   DCHECK_GE(bucket_idx, 0ul);
   DCHECK_LE(bucket_idx, bucket_count_);
   return bucket_idx;