diff --git a/akka-cluster/src/main/java/akka/cluster/ClusterProtocol.java b/akka-cluster/src/main/java/akka/cluster/ClusterProtocol.java
index 8d18fc319b..a55ad42536 100644
--- a/akka-cluster/src/main/java/akka/cluster/ClusterProtocol.java
+++ b/akka-cluster/src/main/java/akka/cluster/ClusterProtocol.java
@@ -434,7 +434,7 @@ public final class ClusterProtocol {
         maybeForceBuilderInitialization();
       }
       
-      private Builder(BuilderParent parent) {
+      private Builder(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
         super(parent);
         maybeForceBuilderInitialization();
       }
@@ -1247,7 +1247,7 @@ public final class ClusterProtocol {
         maybeForceBuilderInitialization();
       }
       
-      private Builder(BuilderParent parent) {
+      private Builder(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
         super(parent);
         maybeForceBuilderInitialization();
       }
@@ -1849,7 +1849,7 @@ public final class ClusterProtocol {
         maybeForceBuilderInitialization();
       }
       
-      private Builder(BuilderParent parent) {
+      private Builder(com.google.protobuf.GeneratedMessage.BuilderParent parent) {
         super(parent);
         maybeForceBuilderInitialization();
       }