diff --git a/Source/cmGlobalUnixMakefileGenerator3.cxx b/Source/cmGlobalUnixMakefileGenerator3.cxx
index 791bdd48ad..171750a7b6 100644
--- a/Source/cmGlobalUnixMakefileGenerator3.cxx
+++ b/Source/cmGlobalUnixMakefileGenerator3.cxx
@@ -543,6 +543,7 @@ std::string cmGlobalUnixMakefileGenerator3::GenerateBuildCommand(const char* mak
       lg->GetMakefile()->SetStartOutputDirectory
         (this->CMakeInstance->GetStartOutputDirectory());
       lg->GetMakefile()->MakeStartDirectoriesCurrent();
+      lg->SetupPathConversions();
       }
     
     makeCommand += " \"";