diff --git a/lib/CodeGen/DwarfWriter.cpp b/lib/CodeGen/DwarfWriter.cpp
index 5564d2b8e36..12cd5f56794 100644
--- a/lib/CodeGen/DwarfWriter.cpp
+++ b/lib/CodeGen/DwarfWriter.cpp
@@ -80,7 +80,7 @@ public:
     if (O) print(*O);
   }
   void print(std::ostream &O) const {
-    O << ".D" << Tag;
+    O << ".debug_" << Tag;
     if (Number) O << Number;
   }
 #endif