diff --git a/java_gen/templates/_imports.java b/java_gen/templates/_imports.java
index 2d93b22..7fd0719 100644
--- a/java_gen/templates/_imports.java
+++ b/java_gen/templates/_imports.java
@@ -17,3 +17,4 @@
 import org.jboss.netty.buffer.ChannelBuffers;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Sets;