diff --git a/modules/lang-painless/src/main/java/org/elasticsearch/painless/DefMath.java b/modules/lang-painless/src/main/java/org/elasticsearch/painless/DefMath.java
index 65a26cd3da8..f89b1429f38 100644
--- a/modules/lang-painless/src/main/java/org/elasticsearch/painless/DefMath.java
+++ b/modules/lang-painless/src/main/java/org/elasticsearch/painless/DefMath.java
@@ -25,7 +25,6 @@ import java.lang.invoke.MethodType;
 import java.lang.invoke.MethodHandles.Lookup;
 import java.util.Collections;
 import java.util.HashMap;
-import java.util.IdentityHashMap;
 import java.util.Map;
 import java.util.function.Function;
 import java.util.stream.Collectors;