1 files changed, 1 insertions, 1 deletions
diff --git a/py/py.mk b/py/py.mk
index 663237603..f5faad182 100644
--- a/py/py.mk
+++ b/py/py.mk
@@ -74,7 +74,7 @@ endif
 
 ifeq ($(MICROPY_PY_BTREE),1)
 BTREE_DIR = lib/berkeley-db-1.xx
-BTREE_DEFS = -D__DBINTERFACE_PRIVATE=1 -Dmpool_error=printf -Dabort=abort_ -Dvirt_fd_t=mp_obj_t "-DVIRT_FD_T_HEADER=<py/obj.h>"
+BTREE_DEFS = -D__DBINTERFACE_PRIVATE=1 -Dmpool_error=printf -Dabort=abort_ -Dvirt_fd_t=mp_obj_t "-DVIRT_FD_T_HEADER=<py/obj.h>" $(BTREE_DEFS_EXTRA)
 INC += -I$(TOP)/$(BTREE_DIR)/PORT/include
 SRC_MOD += extmod/modbtree.c
 SRC_MOD += $(addprefix $(BTREE_DIR)/,\