diff --git a/src/mesa/drivers/dri/radeon/radeon_texture.c b/src/mesa/drivers/dri/radeon/radeon_texture.c
index 8b1e34f..e0e1dce 100644
--- a/src/mesa/drivers/dri/radeon/radeon_texture.c
+++ b/src/mesa/drivers/dri/radeon/radeon_texture.c
@@ -1036,6 +1036,8 @@ void radeon_image_target_texture_2d(struct gl_context *ctx, GLenum target,
 	texImage->RowStride = image->pitch;
 	texImage->InternalFormat = image->internal_format;
 
+	assert(texImage->TexFormat != MESA_FORMAT_NONE);
+
 	if(t->mt)
 	{
 		radeon_miptree_unreference(&t->mt);