diff --git a/java_gen/templates/_imports.java b/java_gen/templates/_imports.java
index 0c95916..dde3ac0 100644
--- a/java_gen/templates/_imports.java
+++ b/java_gen/templates/_imports.java
@@ -26,6 +26,7 @@
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Sets;
+import com.google.common.collect.AbstractIterator;
 import com.google.common.collect.UnmodifiableIterator;
 import com.google.common.hash.Funnel;
 import com.google.common.hash.PrimitiveSink;