diff --git a/api/server/server.go b/api/server/server.go
index c52c6bd2af..5d6d927485 100644
--- a/api/server/server.go
+++ b/api/server/server.go
@@ -1297,7 +1297,7 @@ func makeHttpHandler(eng *engine.Engine, logging bool, localMethod string, local
 		}
 
 		if version.GreaterThan(api.APIVERSION) {
-			http.Error(w, fmt.Errorf("client and server don't have same version (client : %s, server: %s)", version, api.APIVERSION).Error(), http.StatusNotFound)
+			http.Error(w, fmt.Errorf("client and server don't have same version (client API version: %s, server API version: %s)", version, api.APIVERSION).Error(), http.StatusNotFound)
 			return
 		}