diff --git a/lib/libc/sys/closefrom.c b/lib/libc/sys/closefrom.c
--- a/lib/libc/sys/closefrom.c
+++ b/lib/libc/sys/closefrom.c
@@ -31,15 +31,8 @@
 
 #include "libc_private.h"
 
-#define	CLOSE_RANGE_OSREL		1300091
-
 void
 closefrom(int lowfd)
 {
-
-	if (__getosreldate() >= CLOSE_RANGE_OSREL)
-		__sys_close_range(MAX(0, lowfd), ~0U, 0);
-	else
-		/* Fallback to closefrom(2) on older kernels. */
-		syscall(SYS_freebsd12_closefrom, lowfd);
+	__sys_close_range(MAX(0, lowfd), ~0U, 0);
 }