diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index e95bb5ef39..098c9c93ec 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -397,6 +397,10 @@ void cmGlobalGenerator::SetLanguageEnabled(const char* l, cmMakefile* mf)
 }
 bool cmGlobalGenerator::IgnoreFile(const char* l)
 {
+  if(this->GetLanguageFromExtension(l))
+    {
+    return false;
+    }
   return (m_IgnoreExtensions.count(l) > 0);
 }