diff --git a/Source/cmLocale.h b/Source/cmLocale.h
index e8e751d1d9..cca7cf5491 100644
--- a/Source/cmLocale.h
+++ b/Source/cmLocale.h
@@ -6,10 +6,11 @@
 #include <cmConfigure.h>
 
 #include <locale.h>
+#include <string>
 
 class cmLocaleRAII
 {
-  const char* OldLocale;
+  std::string OldLocale;
 
 public:
   cmLocaleRAII()
@@ -17,7 +18,7 @@ public:
   {
     setlocale(LC_CTYPE, "");
   }
-  ~cmLocaleRAII() { setlocale(LC_CTYPE, this->OldLocale); }
+  ~cmLocaleRAII() { setlocale(LC_CTYPE, this->OldLocale.c_str()); }
 };
 
 #endif