diff --git a/src/vs/workbench/api/node/extHost.api.impl.ts b/src/vs/workbench/api/node/extHost.api.impl.ts
index 2ce97028827..ee6e7186c07 100644
--- a/src/vs/workbench/api/node/extHost.api.impl.ts
+++ b/src/vs/workbench/api/node/extHost.api.impl.ts
@@ -240,7 +240,6 @@ export function createApiFactory(
 				return extHostDiagnostics.createDiagnosticCollection(name);
 			},
 			get onDidChangeDiagnostics() {
-				checkProposedApiEnabled(extension);
 				return extHostDiagnostics.onDidChangeDiagnostics;
 			},
 			getDiagnostics: (resource?) => {