diff --git a/lib/context.js b/lib/context.js
index dac144f..386f99d 100644
--- a/lib/context.js
+++ b/lib/context.js
@@ -72,7 +72,7 @@ var proto = module.exports = {
 
     var err = msg instanceof Error ? msg : new Error(msg);
     err.status = status || 500;
-    err.expose = true;
+    err.expose = err.status < 500;
     throw err;
   },
 
diff --git a/test/context/throw.js b/test/context/throw.js
index 184d5da..ee06976 100644
--- a/test/context/throw.js
+++ b/test/context/throw.js
@@ -10,6 +10,7 @@ describe('ctx.throw(msg)', function(){
       ctx.throw('boom');
     } catch (err) {
       assert(500 == err.status);
+      assert(false === err.expose);
       done();
     }
   })