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-rw-r--r--src/lread.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/lread.c b/src/lread.c
index 525e045b02..ec23028c9f 100644
--- a/src/lread.c
+++ b/src/lread.c
@@ -1054,6 +1054,8 @@ openp (path, str, suffixes, storeptr, predicate)
Lisp_Object string, tail, encoded_fn;
int max_suffix_len = 0;
+ CHECK_STRING (str);
+
for (tail = suffixes; CONSP (tail); tail = XCDR (tail))
{
CHECK_STRING_CAR (tail);