diff --git a/db/filename.h b/db/filename.h
index 6425eb955ac4cd9524c4b7cc69c8924003864a74..103f20652061dcb0fe2fc134ba93819e3b4bafc4 100644
--- a/db/filename.h
+++ b/db/filename.h
@@ -102,11 +102,13 @@ struct InfoLogPrefix {
 
 // Return the name of the info log file for "dbname".
 extern std::string InfoLogFileName(const std::string& dbname,
-    const std::string& db_path="", const std::string& log_dir="");
+                                   const std::string& db_path = "",
+                                   const std::string& log_dir = "");
 
 // Return the name of the old info log file for "dbname".
 extern std::string OldInfoLogFileName(const std::string& dbname, uint64_t ts,
-    const std::string& db_path="", const std::string& log_dir="");
+                                      const std::string& db_path = "",
+                                      const std::string& log_dir = "");
 
 // Return the name to use for a metadatabase. The result will be prefixed with
 // "dbname".