diff --git a/src/vs/editor/contrib/parameterHints/parameterHintsWidget.ts b/src/vs/editor/contrib/parameterHints/parameterHintsWidget.ts
index e0eff6924f80f2ad6a6cca6f1dc90728a7c90407..65e60300d88f10e93116d254ba4b25ed52c9fdac 100644
--- a/src/vs/editor/contrib/parameterHints/parameterHintsWidget.ts
+++ b/src/vs/editor/contrib/parameterHints/parameterHintsWidget.ts
@@ -126,7 +126,7 @@ export class ParameterHintsModel extends Disposable {
 		this.pending = true;
 
 		this.provideSignatureHelpRequest = createCancelablePromise(token =>
-			provideSignatureHelp(model!, position!, triggerContext, token));
+			provideSignatureHelp(model, position, triggerContext, token));
 
 		return this.provideSignatureHelpRequest.then(result => {
 			this.pending = false;