diff --git a/src/vs/workbench/api/node/extHost.api.impl.ts b/src/vs/workbench/api/node/extHost.api.impl.ts
index 63577a50a36..cea90bb2a5b 100644
--- a/src/vs/workbench/api/node/extHost.api.impl.ts
+++ b/src/vs/workbench/api/node/extHost.api.impl.ts
@@ -829,7 +829,9 @@ function defineAPI(factory: IExtensionApiFactory, extensionPaths: TernarySearchT
 
 		// fall back to a default implementation
 		if (!defaultApiImpl) {
-			console.warn(`Could not identify extension for 'vscode' require call from ${parent.filename}`);
+			let extensionPathsPretty = '';
+			extensionPaths.forEach((value, index) => extensionPathsPretty += `\t${index} -> ${value.id}\n`);
+			console.warn(`Could not identify extension for 'vscode' require call from ${parent.filename}. These are the extension path mappings: \n${extensionPathsPretty}`);
 			defaultApiImpl = factory(nullExtensionDescription);
 		}
 		return defaultApiImpl;