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-rw-r--r--src/mesa/drivers/dri/tdfx/tdfx_screen.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/tdfx/tdfx_screen.c b/src/mesa/drivers/dri/tdfx/tdfx_screen.c
index 0a4499cfae7..5e3d07f65bb 100644
--- a/src/mesa/drivers/dri/tdfx/tdfx_screen.c
+++ b/src/mesa/drivers/dri/tdfx/tdfx_screen.c
@@ -393,7 +393,7 @@ static __GLcontextModes *tdfxFillInModes(unsigned pixel_bits,
m->accumRedBits = accum ? 16 : 0;
m->accumGreenBits = accum ? 16 : 0;
m->accumBlueBits = accum ? 16 : 0;
- m->accumAlphaBits = accum ? 16 : 0;
+ m->accumAlphaBits = (accum && deep) ? 16 : 0;
m->stencilBits = stencil ? 8 : 0;
m->depthBits = deep
? (depth ? 24 : 0)