diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 71359a2710..604ca2ca5f 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -2304,7 +2304,8 @@ bool cmMakefile::CanIWriteThisFile(std::string const& fileName) const
   }
 
   return !cmSystemTools::IsSubDirectory(fileName, this->GetHomeDirectory()) ||
-    cmSystemTools::IsSubDirectory(fileName, this->GetHomeOutputDirectory());
+    cmSystemTools::IsSubDirectory(fileName, this->GetHomeOutputDirectory()) ||
+    cmSystemTools::SameFile(fileName, this->GetHomeOutputDirectory());
 }
 
 const char* cmMakefile::GetRequiredDefinition(const std::string& name) const