diff --git a/include/irrUString.h b/include/irrUString.h
index 9b6c2417..e01418f0 100644
--- a/include/irrUString.h
+++ b/include/irrUString.h
@@ -597,7 +597,7 @@ public:
 					return difference_type();
 
 				_Iter i = iter;
-				difference_type ret;
+				difference_type ret{};
 
 				// Walk up.
 				if (pos > i.pos)