diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 31242762f..91ef6b34f 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -463,7 +463,7 @@ cmGlobalGenerator::EnableLanguage(std::vector<std::string>const& languages,
   // cmake
   std::string projectCompatibility = mf->GetDefinition("CMAKE_ROOT");
   projectCompatibility += "/Modules/";
-  projectCompatibility += mf->GetDefinition("PROJECT_NAME");
+  projectCompatibility += mf->GetSafeDefinition("PROJECT_NAME");
   projectCompatibility += "Compatibility.cmake";
   if(cmSystemTools::FileExists(projectCompatibility.c_str()))
     {