diff --git a/src/vs/code/electron-main/auth.ts b/src/vs/code/electron-main/auth.ts
index ca071cf2836..ad6c47e5a31 100644
--- a/src/vs/code/electron-main/auth.ts
+++ b/src/vs/code/electron-main/auth.ts
@@ -64,6 +64,7 @@ export class ProxyAuthHandler extends Disposable {
 				contextIsolation: true,
 				enableWebSQL: false,
 				enableRemoteModule: false,
+				spellcheck: false,
 				devTools: false
 			}
 		};
diff --git a/src/vs/code/electron-main/sharedProcess.ts b/src/vs/code/electron-main/sharedProcess.ts
index a6ef6be6ce1..86ebb7ff932 100644
--- a/src/vs/code/electron-main/sharedProcess.ts
+++ b/src/vs/code/electron-main/sharedProcess.ts
@@ -45,6 +45,7 @@ export class SharedProcess implements ISharedProcess {
 				nodeIntegration: true,
 				enableWebSQL: false,
 				enableRemoteModule: false,
+				spellcheck: false,
 				nativeWindowOpen: true,
 				images: false,
 				webgl: false,
diff --git a/src/vs/code/electron-main/window.ts b/src/vs/code/electron-main/window.ts
index 40cbd5b9a43..39444b53839 100644
--- a/src/vs/code/electron-main/window.ts
+++ b/src/vs/code/electron-main/window.ts
@@ -169,6 +169,7 @@ export class CodeWindow extends Disposable implements ICodeWindow {
 					preload: URI.parse(this.doGetPreloadUrl()).fsPath,
 					enableWebSQL: false,
 					enableRemoteModule: false,
+					spellcheck: false,
 					nativeWindowOpen: true,
 					webviewTag: true,
 					zoomFactor: zoomLevelToZoomFactor(windowConfig?.zoomLevel),
diff --git a/src/vs/platform/issue/electron-main/issueMainService.ts b/src/vs/platform/issue/electron-main/issueMainService.ts
index 31e3888364e..817951f6be5 100644
--- a/src/vs/platform/issue/electron-main/issueMainService.ts
+++ b/src/vs/platform/issue/electron-main/issueMainService.ts
@@ -199,6 +199,7 @@ export class IssueMainService implements ICommonIssueService {
 							preload: URI.parse(require.toUrl('vs/base/parts/sandbox/electron-browser/preload.js')).fsPath,
 							enableWebSQL: false,
 							enableRemoteModule: false,
+							spellcheck: false,
 							nativeWindowOpen: true,
 							zoomFactor: zoomLevelToZoomFactor(data.zoomLevel),
 							...this.environmentService.sandbox ?
@@ -264,6 +265,7 @@ export class IssueMainService implements ICommonIssueService {
 							preload: URI.parse(require.toUrl('vs/base/parts/sandbox/electron-browser/preload.js')).fsPath,
 							enableWebSQL: false,
 							enableRemoteModule: false,
+							spellcheck: false,
 							nativeWindowOpen: true,
 							zoomFactor: zoomLevelToZoomFactor(data.zoomLevel),
 							...this.environmentService.sandbox ?
diff --git a/test/unit/electron/index.js b/test/unit/electron/index.js
index 6685ff8f713..9aeaaccc844 100644
--- a/test/unit/electron/index.js
+++ b/test/unit/electron/index.js
@@ -121,6 +121,7 @@ app.on('ready', () => {
 			nodeIntegration: true,
 			enableWebSQL: false,
 			enableRemoteModule: false,
+			spellcheck: false,
 			nativeWindowOpen: true,
 			webviewTag: true
 		}