diff --git a/libs/audio/source/mixer.cpp b/libs/audio/source/mixer.cpp
index 95f945fa..ce9e0a40 100644
--- a/libs/audio/source/mixer.cpp
+++ b/libs/audio/source/mixer.cpp
@@ -3,6 +3,7 @@
 #include <memory>
 #include <vector>
 #include <atomic>
+#include <mutex>
 
 namespace psemek::audio
 {