diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 39553c81b6..41ded90ee6 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8490,11 +8490,19 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #endif
 #if defined(CONFIG_DUP3) && defined(TARGET_NR_dup3)
     case TARGET_NR_dup3:
-        ret = get_errno(dup3(arg1, arg2, arg3));
+    {
+        int host_flags;
+
+        if ((arg3 & ~TARGET_O_CLOEXEC) != 0) {
+            return -EINVAL;
+        }
+        host_flags = target_to_host_bitmask(arg3, fcntl_flags_tbl);
+        ret = get_errno(dup3(arg1, arg2, host_flags));
         if (ret >= 0) {
             fd_trans_dup(arg1, arg2);
         }
         break;
+    }
 #endif
 #ifdef TARGET_NR_getppid /* not on alpha */
     case TARGET_NR_getppid: