diff --git a/format.h b/format.h
index 21e163e1..eed9a8ca 100644
--- a/format.h
+++ b/format.h
@@ -2007,7 +2007,8 @@ class BasicWriter {
     return *this;
   }
 
-  BasicWriter &operator<<(typename internal::WCharHelper<StringRef, Char>::Supported value) {
+  BasicWriter &operator<<(
+      typename internal::WCharHelper<StringRef, Char>::Supported value) {
     const char *str = value.c_str();
     buffer_.append(str, str + value.size());
     return *this;