diff --git a/.travis.yml b/.travis.yml
index bc50d38..025a1d5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 node_js:
 - '0.10'
-- '0.12'
+- '4.2.3'
 addons:
   apt:
     sources:
diff --git a/index.js b/index.js
index 08aa03c..5b1be93 100644
--- a/index.js
+++ b/index.js
@@ -341,7 +341,10 @@ Vector.prototype.profile = function(callback) {
                         if (queue.length) {
                             var t = queue.shift();
                             s.getTile(t.z, t.x, t.y, function(err, run1, headers) {
-                                if (err) return callback(err);
+                                if (err) {
+                                    err.code = 'EMAPNIK';
+                                    return callback(err);
+                                }
                                 s.getTile(t.z, t.x, t.y, function(err, run2, headers) {
                                     if (err) return callback(err);
                                     t.drawtime = Math.min(run1._drawtime, run2._drawtime);
diff --git a/test/fixtures/tm2z/invalid.tm2z b/test/fixtures/tm2z/invalid.tm2z
new file mode 100644
index 0000000..d3c3d5b
Binary files /dev/null and b/test/fixtures/tm2z/invalid.tm2z differ
diff --git a/test/tm2z.js b/test/tm2z.js
index 7eb8a2f..dc93381 100644
--- a/test/tm2z.js
+++ b/test/tm2z.js
@@ -179,7 +179,7 @@ test('errors out if unzipped project.xml size exceeds custom max size', function
 });
 test('errors out if not a directory', function(t) {
     tilelive.load('tm2z://' + path.join(fixtureDir, 'nodirectory.tm2z'), function(err, source) {
-        t.equal(err.message.split(',')[0], 'EISDIR');
+        t.ok(err.message.indexOf('EISDIR') !== -1);
         t.end();
     });
 });
@@ -250,6 +250,16 @@ test('profiles a tm2z file', function(t) {
         });
     });
 });
+test('errors with EMAPNIK when profiling invalid tm2z', function(t) {
+    tilelive.load('tm2z://' + path.join(fixtureDir, 'invalid.tm2z'), function(err, source) {
+        t.ifError(err);
+        source.profile(function(err, profile) {
+            t.equal('EMAPNIK', err.code);
+            t.equal(err.message, 'Tile does not exist');
+            t.end();
+        });
+    });
+});
 
 test('loads a tm2z+http url', function(t) {
     tilelive.load('tm2z+' + remotePath, function(err, source) {