diff --git a/ui/src/views/compute/AssignInstance.vue b/ui/src/views/compute/AssignInstance.vue
index 274c68cd702..9b61125d033 100644
--- a/ui/src/views/compute/AssignInstance.vue
+++ b/ui/src/views/compute/AssignInstance.vue
@@ -107,6 +107,7 @@ export default {
       this.fetchNetworks()
     },
     fetchNetworks () {
+      this.selectedNetwork = null
       this.loading = true
       var params = {
         domainId: this.selectedDomain,