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-rw-r--r--src/mesa/swrast/s_readpix.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mesa/swrast/s_readpix.c b/src/mesa/swrast/s_readpix.c
index 553fd9a76d8..1de481248b1 100644
--- a/src/mesa/swrast/s_readpix.c
+++ b/src/mesa/swrast/s_readpix.c
@@ -191,7 +191,8 @@ fast_read_rgba_pixels( GLcontext *ctx,
if (!rb)
return GL_FALSE;
- ASSERT(rb->_BaseFormat == GL_RGBA || rb->_BaseFormat == GL_RGB);
+ ASSERT(rb->_BaseFormat == GL_RGBA || rb->_BaseFormat == GL_RGB ||
+ rb->_BaseFormat == GL_ALPHA);
/* clipping should have already been done */
ASSERT(x + width <= (GLint) rb->Width);