diff --git a/app/dts/bindings/behaviors/zmk,behavior-sticky-key.yaml b/app/dts/bindings/behaviors/zmk,behavior-sticky-key.yaml
index c04883c0..172f20a2 100644
--- a/app/dts/bindings/behaviors/zmk,behavior-sticky-key.yaml
+++ b/app/dts/bindings/behaviors/zmk,behavior-sticky-key.yaml
@@ -13,6 +13,7 @@ properties:
     required: true
   release-after-ms:
     type: int
+    required: true
   quick-release:
     type: boolean
   ignore-modifiers: