diff --git a/src/vs/workbench/api/browser/viewsContainersExtensionPoint.ts b/src/vs/workbench/api/browser/viewsContainersExtensionPoint.ts
index 1d28b39193453a04a87d54e26aea841291aa43b0..5a2e2b7896529eb2085d6773cdba3cf23ac50d5a 100644
--- a/src/vs/workbench/api/browser/viewsContainersExtensionPoint.ts
+++ b/src/vs/workbench/api/browser/viewsContainersExtensionPoint.ts
@@ -78,7 +78,7 @@ class ViewsContainersExtensionHandler implements IWorkbenchContribution {
 		viewsContainersExtensionPoint.setHandler((extensions) => {
 			for (let extension of extensions) {
 				const { value, collector } = extension;
-				if (extension.description.enableProposedApi) {
+				if (!extension.description.enableProposedApi) {
 					collector.error(localize('proposed', "'{0}' contribution is only available when running out of dev or with the following command line switch: --enable-proposed-api {1}", 'viewsContainer', extension.description.id));
 					continue;
 				}