diff --git a/userspace/files/99-modem-diag.rules b/userspace/files/99-modem-diag.rules
new file mode 100644
index 0000000..0441812
--- /dev/null
+++ b/userspace/files/99-modem-diag.rules
@@ -0,0 +1 @@
+KERNEL=="ttyUSB0",ENV{ID_MM_DEVICE_IGNORE}="1"