diff --git a/src/mixer.cpp b/src/mixer.cpp
index b9b20fccfd..91a496404c 100644
--- a/src/mixer.cpp
+++ b/src/mixer.cpp
@@ -17,6 +17,11 @@
 #include "safeguards.h"
 #include "mixer.h"
 
+#include <mutex>
+#if defined(__MINGW32__)
+#include "3rdparty/mingw-std-threads/mingw.mutex.h"
+#endif
+
 struct MixerChannel {
 	bool active;