diff --git a/lib/CodeGen/AsmPrinter/DwarfWriter.cpp b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
index ec17c48..0adbf17 100644
--- a/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
@@ -2091,7 +2091,7 @@
   void ConstructRootDbgScope(DbgScope *RootScope) {
     // Exit if there is no root scope.
     if (!RootScope) return;
-    if (!RootScope->getDesc()->isNull()) return;
+    if (RootScope->getDesc()->isNull()) return;
 
     // Get the subprogram debug information entry.
     DISubprogram SPD(RootScope->getDesc()->getGV());