1 files changed, 1 insertions, 1 deletions
diff --git a/sysif.c b/sysif.c
index 2c68b6d9..2cb9d378 100644
--- a/sysif.c
+++ b/sysif.c
@@ -1048,7 +1048,7 @@ static val setgroups_wrap(val list)
   cnum len = c_num(length(list));
   size_t size = len;
 
-  if ((cnum) size != len) {
+  if (convert(cnum, size) != len) {
     uw_throwf(system_error_s, lit("setgroups: list too long"), nao);
   } else {
     gid_t *arr = coerce(gid_t *, chk_malloc(size *sizeof *arr));