diff --git a/eth/tracers/internal/tracetest/makeTest.js b/eth/tracers/internal/tracetest/makeTest.js
index aa2b0b66b8..64dc36d52f 100644
--- a/eth/tracers/internal/tracetest/makeTest.js
+++ b/eth/tracers/internal/tracetest/makeTest.js
@@ -53,8 +53,8 @@ var makeTest = function(tx, traceConfig) {
         input:   eth.getRawTransaction(tx),
         result:  result,
     };
-    if (traceConfig) {
-        data.tracerConfig = traceConfig;
+    if (traceConfig && traceConfig.tracerConfig) {
+        data.tracerConfig = traceConfig.tracerConfig;
     }
 
     console.log(JSON.stringify(data, null, 2));