diff --git a/velox/functions/prestosql/MapFunctions.h b/velox/functions/prestosql/MapFunctions.h
index c319f4f0e327..ec34e1d3b81e 100644
--- a/velox/functions/prestosql/MapFunctions.h
+++ b/velox/functions/prestosql/MapFunctions.h
@@ -32,4 +32,21 @@ struct MapKeyExists {
   }
 };
 
+template <typename TExec>
+struct MapRemoveNullValues {
+  VELOX_DEFINE_FUNCTION_TYPES(TExec);
+
+  void call(
+      out_type<Map<Generic<T1>, Generic<T2>>>& out,
+      const arg_type<Map<Generic<T1>, Generic<T2>>>& inputMap) {
+    for (const auto& entry : inputMap) {
+      if (entry.second.has_value()) {
+        auto [keyWriter, valueWriter] = out.add_item();
+        keyWriter.copy_from(entry.first);
+        valueWriter.copy_from(entry.second.value());
+      }
+    }
+  }
+};
+
 } // namespace facebook::velox::functions
diff --git a/velox/functions/prestosql/MapRemoveNullValues.h b/velox/functions/prestosql/MapRemoveNullValues.h
deleted file mode 100644
index 97a781f34154..000000000000
--- a/velox/functions/prestosql/MapRemoveNullValues.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-#pragma once
-
-#include "velox/expression/ComplexViewTypes.h"
-#include "velox/functions/Udf.h"
-
-namespace facebook::velox::functions {
-
-template <typename TExec>
-struct MapRemoveNullValues {
-  VELOX_DEFINE_FUNCTION_TYPES(TExec);
-
-  void call(
-      out_type<Map<Generic<T1>, Generic<T2>>>& out,
-      const arg_type<Map<Generic<T1>, Generic<T2>>>& inputMap) {
-    for (const auto& entry : inputMap) {
-      if (entry.second.has_value()) {
-        auto [keyWriter, valueWriter] = out.add_item();
-        keyWriter.copy_from(entry.first);
-        valueWriter.copy_from(entry.second.value());
-      }
-    }
-  }
-};
-
-} // namespace facebook::velox::functions
diff --git a/velox/functions/prestosql/registration/MapFunctionsRegistration.cpp b/velox/functions/prestosql/registration/MapFunctionsRegistration.cpp
index 33a72fc917fa..e38518634871 100644
--- a/velox/functions/prestosql/registration/MapFunctionsRegistration.cpp
+++ b/velox/functions/prestosql/registration/MapFunctionsRegistration.cpp
@@ -21,7 +21,6 @@
 #include "velox/functions/prestosql/MapFunctions.h"
 #include "velox/functions/prestosql/MapKeysByTopNValues.h"
 #include "velox/functions/prestosql/MapNormalize.h"
-#include "velox/functions/prestosql/MapRemoveNullValues.h"
 #include "velox/functions/prestosql/MapSubset.h"
 #include "velox/functions/prestosql/MapTopN.h"
 #include "velox/functions/prestosql/MapTopNKeys.h"