diff --git a/include/llvm/Support/Endian.h b/include/llvm/Support/Endian.h
index 75f3292ac4a..47b82fdc497 100644
--- a/include/llvm/Support/Endian.h
+++ b/include/llvm/Support/Endian.h
@@ -93,6 +93,16 @@ struct packed_endian_specific_integral {
       (void*)Value.buffer, newValue);
   }
 
+  packed_endian_specific_integral &operator+=(value_type newValue) {
+    *this = *this + newValue;
+    return *this;
+  }
+
+  packed_endian_specific_integral &operator-=(value_type newValue) {
+    *this = *this - newValue;
+    return *this;
+  }
+
 private:
   AlignedCharArray<PickAlignment<value_type, alignment>::value,
                    sizeof(value_type)> Value;