diff --git a/posix/tst-nice.c b/posix/tst-nice.c
index ac78d60..814891d 100644
--- a/posix/tst-nice.c
+++ b/posix/tst-nice.c
@@ -56,8 +56,17 @@ do_test (void)
       return 1;
     }
 
-  printf ("PASS: nice(%d) from %d return: %d\n", incr, old, ret);
+  /* BZ #18086. Make sure we don't reset errno.  */
+  errno = EBADF;
+  nice (0);
+  if (errno != EBADF)
+    {
+      printf ("FAIL: errno = %i, but wanted EBADF (%i)\n", errno, EBADF);
+      return 1;
+    }
+
 
+  printf ("PASS: nice(%d) from %d return: %d\n", incr, old, ret);
   return 0;
 }
 
diff --git a/sysdeps/posix/nice.c b/sysdeps/posix/nice.c
index 42bb99b..8f6daaf 100644
--- a/sysdeps/posix/nice.c
+++ b/sysdeps/posix/nice.c
@@ -36,16 +36,16 @@ nice (int incr)
     {
       if (errno != 0)
 	return -1;
-      else
-	__set_errno (save);
     }
 
   result = __setpriority (PRIO_PROCESS, 0, prio + incr);
   if (result == -1)
     {
       if (errno == EACCES)
-	errno = EPERM;
+	__set_errno (EPERM);
       return -1;
     }
+
+  __set_errno (save);
   return __getpriority (PRIO_PROCESS, 0);
 }