diff --git a/unix/Makefile b/unix/Makefile
index f324780c46..febf83cb38 100644
--- a/unix/Makefile
+++ b/unix/Makefile
@@ -242,6 +242,7 @@ nanbox:
 	BUILD=build-nanbox \
 	PROG=micropython_nanbox \
 	MICROPY_FORCE_32BIT=1 \
+	MICROPY_PY_USSL=0
 
 freedos:
 	$(MAKE) \