diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 4d52b2cfe3..e05870c338 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -13244,8 +13244,9 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1,
                 }
                 poutoff = &outoff;
             }
+            /* Do not sign-extend the count parameter. */
             ret = get_errno(safe_copy_file_range(arg1, pinoff, arg3, poutoff,
-                                                 arg5, arg6));
+                                                 (abi_ulong)arg5, arg6));
             if (!is_error(ret) && ret > 0) {
                 if (arg2) {
                     if (put_user_u64(inoff, arg2)) {