diff --git a/src/mesa/drivers/dri/radeon/radeon_fbo.c b/src/mesa/drivers/dri/radeon/radeon_fbo.c
index f28efa33e9a..322f510f16d 100644
--- a/src/mesa/drivers/dri/radeon/radeon_fbo.c
+++ b/src/mesa/drivers/dri/radeon/radeon_fbo.c
@@ -291,7 +291,7 @@ radeon_create_renderbuffer(GLenum format, __DRIdrawablePrivate *driDrawPriv)
 	    rrb->base.RedBits = 8;
 	    rrb->base.GreenBits = 8;
 	    rrb->base.BlueBits = 8;
-	    rrb->base.AlphaBits = 8;
+	    rrb->base.AlphaBits = 0;
 	    rrb->base.DataType = GL_UNSIGNED_BYTE;
 	    break;
 	case GL_RGBA8: