diff --git a/Android.mk b/Android.mk
index 6878e8a..0f53ed9 100644
--- a/Android.mk
+++ b/Android.mk
@@ -14,17 +14,17 @@
 
 LOCAL_PATH := $(call my-dir)
 
-rootdev_CPPFLAGS := -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE \
-  -D_LARGEFILE64_SOURCE
-
-rootdev_CFLAGS := -Wall -Werror -Wno-sign-compare
+rootdev_CFLAGS := \
+  -D_BSD_SOURCE \
+  -D_FILE_OFFSET_BITS=64 \
+  -D_LARGEFILE_SOURCE \
+  -Wall -Werror -Wno-sign-compare \
 
 # Build the shared library.
 include $(CLEAR_VARS)
 LOCAL_MODULE := librootdev
 LOCAL_CFLAGS += $(rootdev_CFLAGS)
 LOCAL_CLANG := true
-LOCAL_CPPFLAGS += $(rootdev_CPPFLAGS)
 LOCAL_SRC_FILES := rootdev.c
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)
 include $(BUILD_SHARED_LIBRARY)
@@ -34,7 +34,6 @@
 LOCAL_MODULE := rootdev
 LOCAL_CFLAGS += $(rootdev_CFLAGS)
 LOCAL_CLANG := true
-LOCAL_CPPFLAGS += $(rootdev_CPPFLAGS)
 LOCAL_SHARED_LIBRARIES := librootdev
 LOCAL_SRC_FILES := main.c
 include $(BUILD_EXECUTABLE)