diff --git a/src/hb-atomic-private.hh b/src/hb-atomic-private.hh
index 7047e216cffe892cd7c20417e832471a3f604062..9cc3bc5587c89fe6480b5adea8aa54d5c51bace7 100644
--- a/src/hb-atomic-private.hh
+++ b/src/hb-atomic-private.hh
@@ -47,6 +47,14 @@
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
+#if defined(__MINGW32__) && !defined(MemoryBarrier)
+static inline void _HBMemoryBarrier (void) {
+  long dummy = 0;
+  InterlockedExchange (&dummy, 1);
+}
+# define MemoryBarrier _HBMemoryBarrier
+#endif
+
 typedef LONG hb_atomic_int_t;
 #define hb_atomic_int_add(AI, V)	InterlockedExchangeAdd (&(AI), (V))