diff --git a/schemas/webpackOptionsSchema.json b/schemas/webpackOptionsSchema.json
index 7840a8ef2..590c07eba 100644
--- a/schemas/webpackOptionsSchema.json
+++ b/schemas/webpackOptionsSchema.json
@@ -978,6 +978,7 @@
           "additionalProperties": false,
           "properties": {
             "all": {
+              "type": "boolean",
               "description": "fallback value for stats options when an option is not defined (has precedence over local webpack defaults)"
             },
             "context": {