diff --git a/adb/Android.mk b/adb/Android.mk
index 819bad1..efdff5d 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -8,14 +8,12 @@
 adb_host_sanitize :=
 adb_target_sanitize :=
 
-adb_version := $(shell git -C $(LOCAL_PATH) rev-parse --short=12 HEAD 2>/dev/null)-android
-
 ADB_COMMON_CFLAGS := \
     -Wall -Wextra -Werror \
     -Wno-unused-parameter \
     -Wno-missing-field-initializers \
     -Wvla \
-    -DADB_REVISION='"$(adb_version)"' \
+    -DADB_REVISION=\"$(BUILD_NUMBER_FROM_FILE)\" \
 
 ADB_COMMON_posix_CFLAGS := \
     -Wexit-time-destructors \
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index 2c578a9..e675d7d 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -14,8 +14,6 @@
 
 LOCAL_PATH:= $(call my-dir)
 
-fastboot_version := $(shell git -C $(LOCAL_PATH) rev-parse --short=12 HEAD 2>/dev/null)-android
-
 include $(CLEAR_VARS)
 
 LOCAL_C_INCLUDES := \
@@ -39,7 +37,7 @@
 LOCAL_MODULE_HOST_OS := darwin linux windows
 LOCAL_CFLAGS += -Wall -Wextra -Werror -Wunreachable-code
 
-LOCAL_CFLAGS += -DFASTBOOT_REVISION='"$(fastboot_version)"'
+LOCAL_CFLAGS += -DFASTBOOT_REVISION=\"$(BUILD_NUMBER_FROM_FILE)\"
 
 LOCAL_SRC_FILES_linux := usb_linux.cpp
 LOCAL_STATIC_LIBRARIES_linux := libselinux