diff --git a/lib/shared/addon/components/cluster-driver/driver-rke/component.js b/lib/shared/addon/components/cluster-driver/driver-rke/component.js
index 7c8916d1d..8edee55f3 100644
--- a/lib/shared/addon/components/cluster-driver/driver-rke/component.js
+++ b/lib/shared/addon/components/cluster-driver/driver-rke/component.js
@@ -1139,6 +1139,12 @@ export default InputTextFile.extend(ManageLabels, ClusterDriver, {
           cluster.clearProvidersExcept(field);
         }
       }
+    } else {
+      // If validation fails, we stay on the form, so we need to undo the formatting of the max unavailable worker
+      // otherwise we keep adding a '%' to the input field
+      const maxUnavailableWorker = get(this, 'upgradeStrategy.maxUnavailableWorker');
+
+      set(this, 'upgradeStrategy.maxUnavailableWorker', maxUnavailableWorker.replace('%', ''));
     }
 
     return ok;