diff --git a/usr.bin/gcore/elfcore.c b/usr.bin/gcore/elfcore.c
index d6e702bc992..20e801a4f53 100644
--- a/usr.bin/gcore/elfcore.c
+++ b/usr.bin/gcore/elfcore.c
@@ -634,8 +634,7 @@ static void *
 elf_note_procstat_groups(void *arg, size_t *sizep)
 {
 
-	return (procstat_sysctl(arg, KERN_PROC_GROUPS,
-	    (int)sizeof(gid_t), sizep));
+	return (procstat_sysctl(arg, KERN_PROC_GROUPS, sizeof(gid_t), sizep));
 }
 
 static void *