diff --git a/src/vim9execute.c b/src/vim9execute.c
index bcdc5d1..8a5708c 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -879,7 +879,7 @@
 				return FAIL;
 	    }
 	}
-	str = typval_tostring(tv);
+	str = typval_tostring(tv, TRUE);
 	clear_tv(tv);
 	tv->v_type = VAR_STRING;
 	tv->vval.v_string = str;