diff --git a/google-cloud-clients/google-cloud-firestore/src/main/java/com/google/cloud/firestore/FieldValue.java b/google-cloud-clients/google-cloud-firestore/src/main/java/com/google/cloud/firestore/FieldValue.java
index 4e7d2ab4a050..3ea8f8c1215c 100644
--- a/google-cloud-clients/google-cloud-firestore/src/main/java/com/google/cloud/firestore/FieldValue.java
+++ b/google-cloud-clients/google-cloud-firestore/src/main/java/com/google/cloud/firestore/FieldValue.java
@@ -21,6 +21,7 @@
 import com.google.firestore.v1beta1.DocumentTransform.FieldTransform;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
 import javax.annotation.Nonnull;
 
 /** Sentinel values that can be used when writing document fields with set() or update(). */
@@ -112,6 +113,21 @@ FieldTransform toProto(FieldPath path) {
       fieldTransform.setAppendMissingElements(encodedElements);
       return fieldTransform.build();
     }
+
+    @Override
+    public boolean equals(Object o) {
+      if (this == o) {
+        return true;
+      }
+      if (o == null || getClass() != o.getClass()) {
+        return false;
+      }
+      if (!super.equals(o)) {
+        return false;
+      }
+      ArrayUnionFieldValue that = (ArrayUnionFieldValue) o;
+      return Objects.equals(elements, that.elements);
+    }
   }
 
   static class ArrayRemoveFieldValue extends FieldValue {
@@ -150,6 +166,21 @@ FieldTransform toProto(FieldPath path) {
       fieldTransform.setRemoveAllFromArray(encodedElements);
       return fieldTransform.build();
     }
+
+    @Override
+    public boolean equals(Object o) {
+      if (this == o) {
+        return true;
+      }
+      if (o == null || getClass() != o.getClass()) {
+        return false;
+      }
+      if (!super.equals(o)) {
+        return false;
+      }
+      ArrayUnionFieldValue that = (ArrayUnionFieldValue) o;
+      return Objects.equals(elements, that.elements);
+    }
   }
 
   private FieldValue() {}