diff --git a/clang/lib/Basic/Targets/SystemZ.cpp b/clang/lib/Basic/Targets/SystemZ.cpp
index 30f846cb900f8..ecd12ed34a20c 100644
--- a/clang/lib/Basic/Targets/SystemZ.cpp
+++ b/clang/lib/Basic/Targets/SystemZ.cpp
@@ -205,7 +205,7 @@ void SystemZTargetInfo::getTargetDefines(const LangOptions &Opts,
     Librel |= V.getSubminor().value_or(0);
     Str += llvm::utohexstr(Librel);
 
-    Builder.defineMacro("__TARGET_LIB__", Str.c_str());
+    Builder.defineMacro("__TARGET_LIB__", Str);
   }
 }