diff --git a/src/shrpx.cc b/src/shrpx.cc
index 2d185b9..2f78a02 100644
--- a/src/shrpx.cc
+++ b/src/shrpx.cc
@@ -324,7 +324,7 @@ void fill_default_config()
   mod_config()->daemon = false;
   mod_config()->verify_client = false;
 
-  mod_config()->server_name = "shrpx spdylay/"SPDYLAY_VERSION;
+  mod_config()->server_name = "shrpx spdylay/" SPDYLAY_VERSION;
   set_config_str(&mod_config()->host, "0.0.0.0");
   mod_config()->port = 3000;
   mod_config()->private_key_file = 0;