diff --git a/bootloaders/riotboot/Makefile b/bootloaders/riotboot/Makefile
index 34c96a2861..4249e0dc0c 100644
--- a/bootloaders/riotboot/Makefile
+++ b/bootloaders/riotboot/Makefile
@@ -16,6 +16,7 @@ CFLAGS += -DRIOTBOOT
 CFLAGS += -DNDEBUG -DLOG_LEVEL=LOG_NONE
 DISABLE_MODULE += core_init core_msg core_panic
 DISABLE_MODULE += auto_init
+DISABLE_MODULE += stdio_cdc_acm
 
 # Include riotboot flash partition functionality
 USEMODULE += riotboot_slot