diff --git a/SDL2pp/Audio.hh b/SDL2pp/Audio.hh
index ffbd554..baee880 100644
--- a/SDL2pp/Audio.hh
+++ b/SDL2pp/Audio.hh
@@ -60,6 +60,7 @@ public:
 		LockHandle(AudioDevice* device);
 
 	public:
+		LockHandle();
 		~LockHandle();
 
 		LockHandle(LockHandle&& other) noexcept;
diff --git a/SDL2pp/AudioLock.cc b/SDL2pp/AudioLock.cc
index d426856..4193a98 100644
--- a/SDL2pp/AudioLock.cc
+++ b/SDL2pp/AudioLock.cc
@@ -23,6 +23,9 @@
 
 namespace SDL2pp {
 
+AudioDevice::LockHandle::LockHandle() : device_(nullptr) {
+}
+
 AudioDevice::LockHandle::LockHandle(AudioDevice* device) : device_(device) {
 	SDL_LockAudioDevice(device_->device_id_);
 }