diff --git a/src/api.cc b/src/api.cc
index b46d376837..a97b38d00a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -10217,6 +10217,10 @@ const char* CodeEvent::GetCodeEventTypeName(CodeEventType code_event_type) {
       CODE_EVENTS_LIST(V)
 #undef V
   }
+  // The execution should never pass here
+  UNREACHABLE();
+  // NOTE(mmarchini): Workaround to fix a compiler failure on GCC 4.9
+  return "Unknown";
 }

 CodeEventHandler::CodeEventHandler(Isolate* isolate) {
diff --git a/src/log.cc b/src/log.cc
index d1673715e5..f70acbd54d 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -59,6 +59,10 @@ static v8::CodeEventType GetCodeEventTypeForTag(
       TAGS_LIST(V)
 #undef V
   }
+  // The execution should never pass here
+  UNREACHABLE();
+  // NOTE(mmarchini): Workaround to fix a compiler failure on GCC 4.9
+  return v8::CodeEventType::kUnknownType;
 }
 #define CALL_CODE_EVENT_HANDLER(Call) \
   if (listener_) {                    \