diff --git a/src/audiomixerboard.cpp b/src/audiomixerboard.cpp
index a907efbd..cec9552d 100644
--- a/src/audiomixerboard.cpp
+++ b/src/audiomixerboard.cpp
@@ -137,7 +137,7 @@ CChannelFader::CChannelFader ( QWidget* pNW,
pPan->setWhatsThis ( "" + tr ( "Panning" ) + ":" + tr (
"Sets the panning position from Left to Right of the channel. "
- "Works only in stero or preferably mono in/stereo out mode." ) );
+ "Works only in stereo or preferably mono in/stereo out mode." ) );
pPan->setAccessibleName ( tr ( "Local panning position of the current audio channel at the server" ) );
pcbMute->setWhatsThis ( "" + tr ( "Mute" ) + ": " + tr (