diff --git a/Android.mk b/Android.mk
index 3a68b88..9e27ce8 100644
--- a/Android.mk
+++ b/Android.mk
@@ -2,6 +2,7 @@
 
 libpcap_cflags := \
   -Wno-unused-parameter \
+  -D_BSD_SOURCE \
   -D_U_="__attribute__((unused))" \
   -Werror \