diff --git a/src/common/rectangle.h b/src/common/rectangle.h
index 0728915c6..1521f4fba 100644
--- a/src/common/rectangle.h
+++ b/src/common/rectangle.h
@@ -70,6 +70,7 @@ struct Rectangle
     top = rhs.top;
     left = rhs.left;
     bottom = rhs.bottom;
+    return *this;
   }
 
   // Relational operators.