diff --git a/ports/nrf/Makefile b/ports/nrf/Makefile
index 9da2c498d0..fad127514b 100755
--- a/ports/nrf/Makefile
+++ b/ports/nrf/Makefile
@@ -95,8 +95,7 @@ ifeq ($(DEBUG), 1)
   CFLAGS += -fno-inline -fno-ipa-sra
 else
   CFLAGS += -Os -DNDEBUG
-  # TODO: Test with -flto
-  ### CFLAGS += -flto
+  CFLAGS += -flto -flto-partition=none
 endif
 
 
diff --git a/ports/nrf/device/nrf52/startup_nrf52840.c b/ports/nrf/device/nrf52/startup_nrf52840.c
index 30634a1b54..8e1c360128 100644
--- a/ports/nrf/device/nrf52/startup_nrf52840.c
+++ b/ports/nrf/device/nrf52/startup_nrf52840.c
@@ -116,7 +116,7 @@ void CRYPTOCELL_IRQHandler       (void) __attribute__ ((weak, alias("Default_Han
 void SPIM3_IRQHandler            (void) __attribute__ ((weak, alias("Default_Handler")));
 void PWM3_IRQHandler             (void) __attribute__ ((weak, alias("Default_Handler")));
 
-const func __Vectors[] __attribute__ ((section(".isr_vector"))) = {
+const func __Vectors[] __attribute__ ((used, section(".isr_vector"))) = {
     (func)&_estack,
     Reset_Handler,
     NMI_Handler,