diff --git a/simgear/sound/soundmgr_openal.cxx b/simgear/sound/soundmgr_openal.cxx
index 7c7b89b6..daf0729e 100644
--- a/simgear/sound/soundmgr_openal.cxx
+++ b/simgear/sound/soundmgr_openal.cxx
@@ -86,6 +86,7 @@ SGSoundMgr::SGSoundMgr() {
 
     // exaggerate the ear candy?
     alDopplerFactor(1.0);
+    alDopplerVelocity(340.0);	// speed of sound in meters per second.
 }
 
 // destructor