diff --git a/src/components/forms/custom-form-builder.tsx b/src/components/forms/custom-form-builder.tsx
index b787507..72674f8 100644
--- a/src/components/forms/custom-form-builder.tsx
+++ b/src/components/forms/custom-form-builder.tsx
@@ -874,7 +874,7 @@ export function CustomFormBuilder() {
           properties: {
             page: {
               size: { width: 12240, height: 15840 },
-              margin: { top: 1440, right: 1440, bottom: 1440, left: 1440 },
+              margin: (() => { const m = Math.round(marginInches * 1440); return { top: m, right: m, bottom: m, left: m }; })(),
             },
           },
           children,