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-rw-r--r--src/w32.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/w32.c b/src/w32.c
index 0892f932bc2..15e53600d95 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -8611,6 +8611,7 @@ network_interface_list (void)
Lisp_Object
network_interface_info (Lisp_Object ifname)
{
+ CHECK_STRING (ifname);
return network_interface_get_info (ifname);
}