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-rw-r--r--examples/build_system/make/make.mk2
1 files changed, 2 insertions, 0 deletions
diff --git a/examples/build_system/make/make.mk b/examples/build_system/make/make.mk
index 206516eaf..3101b66b9 100644
--- a/examples/build_system/make/make.mk
+++ b/examples/build_system/make/make.mk
@@ -169,6 +169,8 @@ ifeq ($(RTOS),freertos)
$(TOP)/$(FREERTOS_SRC)/include \
$(TOP)/$(FREERTOS_PORTABLE_SRC)
+ CFLAGS += -DCFG_TUSB_OS=OPT_OS_FREERTOS
+
# Suppress FreeRTOSConfig.h warnings
CFLAGS_GCC += -Wno-error=redundant-decls