diff --git a/build/platform.device.n0100.mak b/build/platform.device.n0100.mak
index 8f41cc583..debb5dbc9 100644
--- a/build/platform.device.n0100.mak
+++ b/build/platform.device.n0100.mak
@@ -1,2 +1,3 @@
 TOOLCHAIN ?= arm-gcc-m4f
 ION_KEYBOARD_LAYOUT = layout_B2
+PCB_LATEST = 0
diff --git a/build/platform.device.n0110.mak b/build/platform.device.n0110.mak
index 8767597e6..5f6816850 100644
--- a/build/platform.device.n0110.mak
+++ b/build/platform.device.n0110.mak
@@ -1,2 +1,3 @@
 TOOLCHAIN ?= arm-gcc-m7f
 ION_KEYBOARD_LAYOUT = layout_B3
+PCB_LATEST = 111
diff --git a/ion/src/device/Makefile b/ion/src/device/Makefile
index b4f6a6b11..ad9926bca 100644
--- a/ion/src/device/Makefile
+++ b/ion/src/device/Makefile
@@ -12,7 +12,7 @@ endif
 
 ion_src += ion/src/shared/collect_registers.cpp
 
-ION_DEVICE_SFLAGS = -Iion/src/device/$(MODEL) -Iion/src/device/shared
+ION_DEVICE_SFLAGS = -Iion/src/device/$(MODEL) -Iion/src/device/shared -DPCB_LATEST=$(PCB_LATEST)
 
 $(call object_for,$(ion_device_src) $(ion_device_flasher_src) $(ion_device_bench_src)): SFLAGS += $(ION_DEVICE_SFLAGS)