diff --git a/src/stm32/cdcacm.c b/src/stm32/cdcacm.c
index 4198af50..690081e7 100644
--- a/src/stm32/cdcacm.c
+++ b/src/stm32/cdcacm.c
@@ -47,7 +47,7 @@
 static char *get_dev_unique_id(char *serial_no);
 
 static int configured;
-static int cdcacm_gdb_dtr;
+static int cdcacm_gdb_dtr = 1;
 
 static const struct usb_device_descriptor dev = {
         .bLength = USB_DT_DEVICE_SIZE,