diff --git a/packages/builder-css-styles/blur/index.ts b/packages/builder-css-styles/blur/index.ts
index 0a5eb3fc7..61bc8ce53 100644
--- a/packages/builder-css-styles/blur/index.ts
+++ b/packages/builder-css-styles/blur/index.ts
@@ -1,6 +1,6 @@
 import { roundNumber } from "@reflect-ui/uiutils";
 
-export function blur(o?: number): string {
+export function blur(o?: number): string | undefined {
   if (o === undefined) {
     return;
   }
diff --git a/packages/builder-css-styles/border-radius/index.ts b/packages/builder-css-styles/border-radius/index.ts
index a3d6508c3..b5ea9b17d 100644
--- a/packages/builder-css-styles/border-radius/index.ts
+++ b/packages/builder-css-styles/border-radius/index.ts
@@ -52,7 +52,7 @@ border-radius: unset;
  */
 export function borderRadius(
   r: BorderRadiusManifest | undefined
-): CSSProperties {
+): CSSProperties | undefined {
   if (!r) {
     return;
   }