diff --git a/drivers/gpu/drm/radeon/mkregtable.c b/drivers/gpu/drm/radeon/mkregtable.c
index af85299f212673afd9ce61997aa98b2f286fd2a7..4a85bb644e24036302256ad1f590f4afd5a60850 100644
--- a/drivers/gpu/drm/radeon/mkregtable.c
+++ b/drivers/gpu/drm/radeon/mkregtable.c
@@ -655,7 +655,7 @@ static int parser_auth(struct table *t, const char *filename)
 
 	/* first line will contain the last register
 	 * and gpu name */
-	sscanf(buf, "%s %s", gpu_name, last_reg_s);
+	sscanf(buf, "%9s %9s", gpu_name, last_reg_s);
 	t->gpu_prefix = gpu_name;
 	last_reg = strtol(last_reg_s, NULL, 16);