diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -69,6 +69,7 @@ Src/stm32f0xx_hal_msp.c \
 Src/stm32f0xx_it.c \
 Src/system_stm32f0xx.c \
 Src/system.c \
+Src/ph.c \
 hydrobot-sharedlibs/src/can_buffer.c \
 hydrobot-sharedlibs/src/can.c \
 hydrobot-sharedlibs/src/flash.c \