diff --git a/packages/form-js-editor/src/features/modeling/behavior/ValidateBehavior.js b/packages/form-js-editor/src/features/modeling/behavior/ValidateBehavior.js
index d412e27da..698f9a71c 100644
--- a/packages/form-js-editor/src/features/modeling/behavior/ValidateBehavior.js
+++ b/packages/form-js-editor/src/features/modeling/behavior/ValidateBehavior.js
@@ -21,6 +21,7 @@ export class ValidateBehavior extends CommandInterceptor {
 
           delete newValidate.minLength;
           delete newValidate.maxLength;
+          delete newValidate.custom;
           delete newValidate.pattern;
 
           properties['validate'] = newValidate;