diff --git a/frontend/src/pages/cert-request.vue b/frontend/src/pages/cert-request.vue
index ca6375e..1a7f060 100644
--- a/frontend/src/pages/cert-request.vue
+++ b/frontend/src/pages/cert-request.vue
@@ -61,7 +61,7 @@
           </v-row>
           <v-row>
             <v-col cols="12" md="4">
-              <v-text-field type="number" v-model="validity.duration" label="Duration for validity in Days"/>
+              <v-text-field type="number" v-model="validity.duration" :rules="validity.durationRules" label="Duration for validity in Days"/>
             </v-col>
           </v-row>
           <v-row>