diff --git a/lib/reporters/trace.js b/lib/reporters/trace.js
index 0369ca3..4ef8a4a 100644
--- a/lib/reporters/trace.js
+++ b/lib/reporters/trace.js
@@ -6,8 +6,8 @@ var package = require('../../package');
 
 var config = require('../config');
 
-var COLLECTOR_API_SAMPLE = config.collectorApi + config.collectorApiSampleEndpoint;
-var COLLECTOR_API_SERVICE = config.collectorApi + config.collectorApiServiceEndpoint;
+var COLLECTOR_API_SAMPLE = url.resolve(config.collectorApi, config.collectorApiSampleEndpoint);
+var COLLECTOR_API_SERVICE = url.resolve(config.collectorApi, config.collectorApiServiceEndpoint);
 
 function TraceReporter (options) {
   this.apiKey = options.apiKey || process.env.TRACE_API_KEY;