diff --git a/src/vs/workbench/services/keybinding/electron-browser/keybindingService.ts b/src/vs/workbench/services/keybinding/electron-browser/keybindingService.ts
index 95afbc43b9cc9490d165e2dbf1faf880dbd486f1..df2408ad7f271839456b7d356e373630e59192cd 100644
--- a/src/vs/workbench/services/keybinding/electron-browser/keybindingService.ts
+++ b/src/vs/workbench/services/keybinding/electron-browser/keybindingService.ts
@@ -578,6 +578,7 @@ let schema: IJSONSchema = {
 				'description': nls.localize('keybindings.json.key', "Key or key sequence (separated by space)"),
 			},
 			'command': {
+				'type': 'string',
 				'description': nls.localize('keybindings.json.command', "Name of the command to execute"),
 			},
 			'when': {