diff --git a/src/gallium/drivers/r600/r600_formats.h b/src/gallium/drivers/r600/r600_formats.h
index 9533aaa1378..ad9c51a259a 100644
--- a/src/gallium/drivers/r600/r600_formats.h
+++ b/src/gallium/drivers/r600/r600_formats.h
@@ -115,6 +115,10 @@ static inline bool r600_is_vertex_format_supported(enum pipe_format format)
 	     desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED))
 		return false;
 
+	/* No 8 bit 3 channel formats */
+	if (desc->channel[i].size == 8 && desc->nr_channels == 3)
+		return false;
+
 	return true;
 }