diff --git a/py/circuitpy_defns.mk b/py/circuitpy_defns.mk
index d5bf9753974e..2db1e0dcc833 100644
--- a/py/circuitpy_defns.mk
+++ b/py/circuitpy_defns.mk
@@ -70,7 +70,7 @@ endif
 CIRCUITPY_LTO ?= 0
 CIRCUITPY_LTO_PARTITION ?= balanced
 ifeq ($(CIRCUITPY_LTO),1)
-CFLAGS += -flto -flto-partition=$(CIRCUITPY_LTO_PARTITION) -DCIRCUITPY_LTO=1
+CFLAGS += -flto=jobserver -flto-partition=$(CIRCUITPY_LTO_PARTITION) -DCIRCUITPY_LTO=1
 else
 CFLAGS += -DCIRCUITPY_LTO=0
 endif