diff --git a/packages/opentelemetry-node/src/instrumentation/PluginLoader.ts b/packages/opentelemetry-node/src/instrumentation/PluginLoader.ts
index 23f910b3bb3..186a00ac28d 100644
--- a/packages/opentelemetry-node/src/instrumentation/PluginLoader.ts
+++ b/packages/opentelemetry-node/src/instrumentation/PluginLoader.ts
@@ -84,7 +84,7 @@ export class PluginLoader {
       );
       if (requiredModulesToHook.length > 0) {
         this.logger.warn(
-          `Some modules (${requiredModulesToHook}) were already required when their respective plugin were loaded, some plugins might not work. Make sure the SDK is setup before you require in other modules.`
+          `Some modules (${requiredModulesToHook.join(', ')}) were already required when their respective plugin was loaded, some plugins might not work. Make sure the SDK is setup before you require in other modules.`
         );
       }