diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 52b342fe150fa..75649a747602e 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -103,6 +103,11 @@ class DbgEntity {
 
 class DbgVariable;
 
+bool operator<(const struct FrameIndexExpr &LHS,
+               const struct FrameIndexExpr &RHS);
+bool operator<(const struct EntryValueInfo &LHS,
+               const struct EntryValueInfo &RHS);
+
 /// Proxy for one MMI entry.
 struct FrameIndexExpr {
   int FI;