diff --git a/src/vim9compile.c b/src/vim9compile.c
index 3eae14a..48a913a 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -412,7 +412,8 @@
     // If the actual type can be the expected type add a runtime check.
     if (!actual_is_const && ret == MAYBE && use_typecheck(actual, expected))
     {
-	generate_TYPECHECK(cctx, expected, offset, where.wt_index);
+	generate_TYPECHECK(cctx, expected, offset,
+					    where.wt_variable, where.wt_index);
 	return OK;
     }