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-rw-r--r--src/evalfunc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 55900bd9a..1307d1203 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -6561,7 +6561,7 @@ f_islocked(typval_T *argvars, typval_T *rettv)
rettv->vval.v_number = -1;
end = get_lval(get_tv_string(&argvars[0]), NULL, &lv, FALSE, FALSE,
- GLV_NO_AUTOLOAD, FNE_CHECK_START);
+ GLV_NO_AUTOLOAD | GLV_READ_ONLY, FNE_CHECK_START);
if (end != NULL && lv.ll_name != NULL)
{
if (*end != NUL)