1 files changed, 4 insertions, 0 deletions
diff --git a/clang/include/clang/AST/CharUnits.h b/clang/include/clang/AST/CharUnits.h
index 9a7b3720e81..1044fb742a5 100644
--- a/clang/include/clang/AST/CharUnits.h
+++ b/clang/include/clang/AST/CharUnits.h
@@ -132,6 +132,10 @@ namespace clang {
       CharUnits operator- (const CharUnits &Other) const {
         return CharUnits(Quantity - Other.Quantity);
       }
+      CharUnits operator- () const {
+        return CharUnits(-Quantity);
+      }
+
       
       // Conversions.