diff --git a/doorlockd/client/wave.cpp b/doorlockd/client/wave.cpp
index d7cfbe0..25e4558 100644
--- a/doorlockd/client/wave.cpp
+++ b/doorlockd/client/wave.cpp
@@ -1,6 +1,7 @@
 #include <cstring>
 #include <fstream>
 #include <stdexcept>
+#include <thread>
 
 #include <sndfile.h>
 
@@ -76,6 +77,7 @@ Wave Wave::fromFile(const std::string &filename)
 
 void Wave::play() const
 {
+    std::lock_guard<std::mutex> l(_playMutex);
     if (_device == nullptr) {
         return;
     }
@@ -84,3 +86,10 @@ void Wave::play() const
             (char*)&_data.front(),
             _data.size());
 }
+
+void Wave::playAsync() const
+{
+    std::thread([this] () {
+        play();
+    }).detach();
+}
diff --git a/doorlockd/client/wave.h b/doorlockd/client/wave.h
index b60560c..548dbc2 100644
--- a/doorlockd/client/wave.h
+++ b/doorlockd/client/wave.h
@@ -1,9 +1,10 @@
 #ifndef WAVE_H
 #define WAVE_H
 
+#include <memory>
+#include <mutex>
 #include <string>
 #include <vector>
-#include <memory>
 
 #include <ao/ao.h>
 
@@ -23,9 +24,12 @@ public:
     Wave &operator=(const Wave &rhs);
 
     void play() const;
+    void playAsync() const;
 
 private:
 
+    mutable std::mutex _playMutex = { };
+
     std::unique_ptr<ao_sample_format> _format;
     ao_device* _device = { nullptr };