diff --git a/plugins/win-wasapi/enum-wasapi.cpp b/plugins/win-wasapi/enum-wasapi.cpp
index 8b3a062cb..d65f3a2aa 100644
--- a/plugins/win-wasapi/enum-wasapi.cpp
+++ b/plugins/win-wasapi/enum-wasapi.cpp
@@ -36,7 +36,7 @@ string GetDeviceName(IMMDevice *device)
 	return device_name;
 }
 
-void GetWASAPIAudioDevices_(vector<AudioDeviceInfo> &devices, bool input)
+static void GetWASAPIAudioDevices_(vector<AudioDeviceInfo> &devices, bool input)
 {
 	ComPtr<IMMDeviceEnumerator> enumerator;
 	ComPtr<IMMDeviceCollection> collection;