1 files changed, 1 insertions, 0 deletions
diff --git a/os/hal/hal.mk b/os/hal/hal.mk
index 87a3c6dc3..dddb73f85 100644
--- a/os/hal/hal.mk
+++ b/os/hal/hal.mk
@@ -3,6 +3,7 @@
 HALSRC = ${CHIBIOS}/os/hal/src/hal.c \
          ${CHIBIOS}/os/hal/src/adc.c \
          ${CHIBIOS}/os/hal/src/can.c \
+         ${CHIBIOS}/os/hal/src/ext.c \
          ${CHIBIOS}/os/hal/src/gpt.c \
          ${CHIBIOS}/os/hal/src/i2c.c \
          ${CHIBIOS}/os/hal/src/icu.c \