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diff --git a/include/proj/internal/mutex.hpp b/include/proj/internal/mutex.hpp
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+++ b/include/proj/internal/mutex.hpp
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+/******************************************************************************
+ *
+ * Project:  PROJ
+ * Purpose:  std::mutex emulation
+ * Author:   Even Rouault <even dot rouault at spatialys dot com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2021, Even Rouault <even dot rouault at spatialys dot com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ ****************************************************************************/
+
+#include "proj/util.hpp"
+#include "proj_internal.h"
+
+#ifndef __MINGW32__
+#include <mutex>
+#endif
+
+NS_PROJ_START
+
+#ifdef __MINGW32__
+// mingw32-win32 doesn't implement std::mutex
+class mutex {
+  public:
+    // cppcheck-suppress functionStatic
+    void lock() { pj_acquire_lock(); }
+    // cppcheck-suppress functionStatic
+    void unlock() { pj_release_lock(); }
+};
+
+template <class Lock> struct lock_guard {
+    Lock &lock_;
+    lock_guard(Lock &lock) : lock_(lock) { lock_.lock(); }
+    ~lock_guard() { lock_.unlock(); }
+};
+
+#else
+
+typedef std::mutex mutex;
+template <class Mutex> using lock_guard = std::lock_guard<Mutex>;
+
+#endif
+
+NS_PROJ_END