diff --git a/firmware/Makefile b/firmware/Makefile
index a7b3d1f320..4eb63f0c7c 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -109,7 +109,7 @@ include $(CHIBIOS)/os/various/fatfs_bindings/fatfs.mk
 include $(CHIBIOS)/os/various/cpp_wrappers/chcpp.mk
 
 include console/binary/tunerstudio.mk
-include ext/ext.mk
+include $(PROJECT_DIR)/ext/fatfs.mk
 
 include $(PROJECT_DIR)/hw_layer/hw_layer.mk
 include $(PROJECT_DIR)/hw_layer/sensors/sensors.mk
diff --git a/firmware/ext/fatfs.mk b/firmware/ext/fatfs.mk
new file mode 100644
index 0000000000..c7f4fc2c58
--- /dev/null
+++ b/firmware/ext/fatfs.mk
@@ -0,0 +1,7 @@
+# FATFS files.
+FATFSSRC = ${CHIBIOS}/os/various/fatfs_bindings/fatfs_diskio.c \
+           ${CHIBIOS}/os/various/fatfs_bindings/fatfs_syscall.c \
+           ${PROJECT_DIR}/ext/ff.c \
+           ${PROJECT_DIR}/ext/option/unicode.c
+
+FATFSINC = ${PROJECT_DIR}/ext