diff --git a/src/audio/sampman_oal.cpp b/src/audio/sampman_oal.cpp
index 18d1ca37..fae010ed 100644
--- a/src/audio/sampman_oal.cpp
+++ b/src/audio/sampman_oal.cpp
@@ -282,7 +282,8 @@ set_new_provider(int index)
 		_maxSamples = MAXCHANNELS;
 		
 		ALCint attr[] = {ALC_FREQUENCY,MAX_FREQ,
-						ALC_MONO_SOURCES, MAX_DIGITAL_MIXER_CHANNELS,
+						ALC_MONO_SOURCES, MAX_DIGITAL_MIXER_CHANNELS - MAX2DCHANNELS,
+						ALC_STEREO_SOURCES, MAX2DCHANNELS,
 						0,
 						};