diff --git a/hw/xfree86/drivers/modesetting/drmmode_display.c b/hw/xfree86/drivers/modesetting/drmmode_display.c
index e07555d34..cb48aa46b 100644
--- a/hw/xfree86/drivers/modesetting/drmmode_display.c
+++ b/hw/xfree86/drivers/modesetting/drmmode_display.c
@@ -2840,7 +2840,7 @@ static int parse_path_blob(drmModePropertyBlobPtr path_blob, int *conn_base_id,
     if (len + 1> 5)
         return -1;
     memcpy(conn_id, blob_data + 4, len);
-    conn_id[len + 1] = '\0';
+    conn_id[len] = '\0';
     id = strtoul(conn_id, NULL, 10);
 
     *conn_base_id = id;