diff --git a/src/main/java/com/google/jenkins/plugins/computeengine/InstanceConfiguration.java b/src/main/java/com/google/jenkins/plugins/computeengine/InstanceConfiguration.java
index 8617e761..04b36e40 100644
--- a/src/main/java/com/google/jenkins/plugins/computeengine/InstanceConfiguration.java
+++ b/src/main/java/com/google/jenkins/plugins/computeengine/InstanceConfiguration.java
@@ -597,7 +597,6 @@ private List<ServiceAccount> serviceAccounts() {
     @Extension
     public static final class DescriptorImpl extends Descriptor<InstanceConfiguration> {
         private static ComputeClient computeClient;
-        private static List<ProvisioningType.ProvisioningTypeDescriptor> provisioningTypeDescriptors;
 
         public static void setComputeClient(ComputeClient client) {
             computeClient = client;