diff --git a/apps/openmw/mwsound/openal_output.cpp b/apps/openmw/mwsound/openal_output.cpp
index ddf4df705..e57c1a709 100644
--- a/apps/openmw/mwsound/openal_output.cpp
+++ b/apps/openmw/mwsound/openal_output.cpp
@@ -71,7 +71,7 @@ static ALenum getALFormat(ChannelConfig chans, SampleType type)
 class OpenAL_SoundStream : public Sound
 {
     static const ALuint sNumBuffers = 6;
-    static const ALfloat sBufferLength = 0.125f;
+    static const ALfloat sBufferLength;
 
     OpenAL_Output &mOutput;
 
@@ -101,6 +101,7 @@ public:
     bool process();
 };
 
+const ALfloat OpenAL_SoundStream::sBufferLength = 0.125f;
 
 //
 // A background streaming thread (keeps active streams processed)