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diff --git a/src/x/util.h b/src/x/util.h
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+// Copyright 2021 Benjamin Barenblat
+//
+// 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
+//
+//     https://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.
+
+#ifndef GLPLANET_SRC_X_UTIL_H_
+#define GLPLANET_SRC_X_UTIL_H_
+
+#include <stdlib.h>
+
+namespace x_internal {
+
+// A deleter for std::unique_ptr that `free`s instead of calling `delete`.
+class FreeDeleter final {
+ public:
+  template <typename T>
+  void operator()(T* p) noexcept {
+    free(p);
+  }
+};
+
+}  // namespace x_internal
+
+#endif  // GLPLANET_SRC_X_UTIL_H_