diff --git a/ports/psoc6/mtb-libs/Makefile b/ports/psoc6/mtb-libs/Makefile
index a79db732c3593..e2eff56062bde 100755
--- a/ports/psoc6/mtb-libs/Makefile
+++ b/ports/psoc6/mtb-libs/Makefile
@@ -106,7 +106,7 @@ DISABLE_COMPONENTS=
 # by default, or otherwise not found by the build system.
 SOURCES=
 
-DEFINES=CY_RETARGET_IO_CONVERT_LF_TO_CRLF CY_RTOS_AWARE
+DEFINES=CY_RETARGET_IO_CONVERT_LF_TO_CRLF #CY_RTOS_AWARE
 
 
 ifeq ($(MICROPY_PY_NETWORK),1)