diff --git a/tools/llvm-size/llvm-size.cpp b/tools/llvm-size/llvm-size.cpp
index 25937583a15..b90024908e7 100644
--- a/tools/llvm-size/llvm-size.cpp
+++ b/tools/llvm-size/llvm-size.cpp
@@ -80,7 +80,7 @@ static bool error(error_code ec) {
 static int getNumLengthAsString(uint64_t num) {
   APInt conv(64, num);
   SmallString<32> result;
-  conv.toString(result, unsigned int(Radix), false, true);
+  conv.toString(result, static_cast<unsigned int>(Radix), false, true);
   return result.size();
 }