diff --git a/interfaces/inner_api/event_handler.h b/interfaces/inner_api/event_handler.h
index 47cec1e221bea2b8ef4d3309a2b71b63c2553be8..3bf97799f60531f4d34cf8e41bffce7ad433c88e 100644
--- a/interfaces/inner_api/event_handler.h
+++ b/interfaces/inner_api/event_handler.h
@@ -36,14 +36,15 @@ struct Caller {
     int         line_ {0};
     std::string func_ {""};
 #if __has_builtin(__builtin_FILE)
-    Caller(std::string file = __builtin_FILE(), int line = __builtin_LINE(), std::string func = __builtin_FUNCTION()):
-           file_(file), line_(line), func_(func) {
+    Caller(std::string file = __builtin_FILE(), int line = __builtin_LINE(), std::string func = __builtin_FUNCTION())
+        : file_(file), line_(line), func_(func) {
     }
 #else
     Caller() {
     }
 #endif
-    std::string ToString() {
+    std::string ToString() 
+    {
         if (file_.empty()) {
             return "[ ]";
         }