diff --git a/lib/tests/test.js b/lib/tests/test.js
index 12bebd71..e642e7eb 100644
--- a/lib/tests/test.js
+++ b/lib/tests/test.js
@@ -44,6 +44,7 @@ class Test {
   }
 
   initWeb3Provider(callback) {
+    const self = this;
     if (this.provider) {
       this.provider.stop();
     }