diff --git a/src/tsconfig.strictNullChecks.json b/src/tsconfig.strictNullChecks.json
index 62d2c63d749df54352f128cdef8e5a3206558564..9733d478b67dffd9bbaeaa3929f59acc1f00088e 100644
--- a/src/tsconfig.strictNullChecks.json
+++ b/src/tsconfig.strictNullChecks.json
@@ -570,6 +570,7 @@
 		"./vs/workbench/parts/quickopen/browser/gotoLineHandler.ts",
 		"./vs/workbench/parts/quickopen/browser/gotoSymbolHandler.ts",
 		"./vs/workbench/parts/quickopen/browser/helpHandler.ts",
+		"./vs/workbench/parts/quickopen/browser/quickopen.contribution.ts",
 		"./vs/workbench/parts/quickopen/browser/viewPickerHandler.ts",
 		"./vs/workbench/parts/relauncher/electron-browser/relauncher.contribution.ts",
 		"./vs/workbench/parts/scm/common/scm.ts",
@@ -693,9 +694,9 @@
 		"./vs/workbench/services/decorations/test/browser/decorationsService.test.ts",
 		"./vs/workbench/services/dialogs/electron-browser/dialogService.ts",
 		"./vs/workbench/services/editor/common/editorService.ts",
+		"./vs/workbench/services/extensions/common/extensionHostProtocol.ts",
 		"./vs/workbench/services/extensions/common/extensions.ts",
 		"./vs/workbench/services/extensions/common/extensionsRegistry.ts",
-		"./vs/workbench/services/extensions/common/extensionHostProtocol.ts",
 		"./vs/workbench/services/extensions/electron-browser/cachedExtensionScanner.ts",
 		"./vs/workbench/services/extensions/electron-browser/extensionHostProfiler.ts",
 		"./vs/workbench/services/extensions/electron-browser/inactiveExtensionUrlHandler.ts",
diff --git a/src/vs/workbench/browser/quickopen.ts b/src/vs/workbench/browser/quickopen.ts
index 843dce6d80f7e49524f62719219b887a99f029c1..0e06fe52a83d32e0b0bc5d66e5f6bc50de404db9 100644
--- a/src/vs/workbench/browser/quickopen.ts
+++ b/src/vs/workbench/browser/quickopen.ts
@@ -129,16 +129,16 @@ export interface QuickOpenHandlerHelpEntry {
 export class QuickOpenHandlerDescriptor {
 	prefix: string;
 	description: string;
-	contextKey: string;
+	contextKey?: string;
 	helpEntries: QuickOpenHandlerHelpEntry[];
 	instantProgress: boolean;
 
 	private id: string;
 	private ctor: IConstructorSignature0<QuickOpenHandler>;
 
-	constructor(ctor: IConstructorSignature0<QuickOpenHandler>, id: string, prefix: string, contextKey: string, description: string, instantProgress?: boolean);
-	constructor(ctor: IConstructorSignature0<QuickOpenHandler>, id: string, prefix: string, contextKey: string, helpEntries: QuickOpenHandlerHelpEntry[], instantProgress?: boolean);
-	constructor(ctor: IConstructorSignature0<QuickOpenHandler>, id: string, prefix: string, contextKey: string, param: any, instantProgress: boolean = false) {
+	constructor(ctor: IConstructorSignature0<QuickOpenHandler>, id: string, prefix: string, contextKey: string | undefined, description: string, instantProgress?: boolean);
+	constructor(ctor: IConstructorSignature0<QuickOpenHandler>, id: string, prefix: string, contextKey: string | undefined, helpEntries: QuickOpenHandlerHelpEntry[], instantProgress?: boolean);
+	constructor(ctor: IConstructorSignature0<QuickOpenHandler>, id: string, prefix: string, contextKey: string | undefined, param: any, instantProgress: boolean = false) {
 		this.ctor = ctor;
 		this.id = id;
 		this.prefix = prefix;
diff --git a/src/vs/workbench/parts/quickopen/browser/quickopen.contribution.ts b/src/vs/workbench/parts/quickopen/browser/quickopen.contribution.ts
index e6ffdb918bb5ebd51888e987f1e0518879b46f29..967300cbf2329cc531b468b7b3edec4b086a277f 100644
--- a/src/vs/workbench/parts/quickopen/browser/quickopen.contribution.ts
+++ b/src/vs/workbench/parts/quickopen/browser/quickopen.contribution.ts
@@ -86,7 +86,7 @@ Registry.as<IQuickOpenRegistry>(QuickOpenExtensions.Quickopen).registerQuickOpen
 		GotoLineHandler,
 		GotoLineHandler.ID,
 		GOTO_LINE_PREFIX,
-		null,
+		undefined,
 		[
 			{
 				prefix: GOTO_LINE_PREFIX,
@@ -123,7 +123,7 @@ Registry.as<IQuickOpenRegistry>(QuickOpenExtensions.Quickopen).registerQuickOpen
 		HelpHandler,
 		HelpHandler.ID,
 		HELP_PREFIX,
-		null,
+		undefined,
 		nls.localize('helpDescription', "Show Help")
 	)
 );