diff --git a/lib/CWriter/Writer.cpp b/lib/CWriter/Writer.cpp
index 81c10b7ebee..dd88653449c 100644
--- a/lib/CWriter/Writer.cpp
+++ b/lib/CWriter/Writer.cpp
@@ -114,6 +114,7 @@ static std::string getConstStrValue(const Constant* CPV) {
   default:
     std::cerr << "Unknown constant type: " << CPV << "\n";
     abort();
+    return "";
   }
 }