diff --git a/hw/bsp/stm32f7/family.mk b/hw/bsp/stm32f7/family.mk
index e261b0467..bae7d6d5b 100644
--- a/hw/bsp/stm32f7/family.mk
+++ b/hw/bsp/stm32f7/family.mk
@@ -24,6 +24,7 @@ ifeq ($(PORT), 1)
     $(info "Using OTG_HS in FullSpeed mode")
   endif
 else
+  CFLAGS += -DBOARD_TUD_MAX_SPEED=OPT_MODE_FULL_SPEED
   $(info "Using OTG_FS")
 endif