diff --git a/lib/bbheader_source_impl.h b/lib/bbheader_source_impl.h
index 90bb796..ed9a118 100644
--- a/lib/bbheader_source_impl.h
+++ b/lib/bbheader_source_impl.h
@@ -29,6 +29,7 @@
 #include <netinet/ip.h>
 #include <net/if.h>
 #include <linux/if_tun.h>
+#include <fcntl.h>
 
 #define START_INDICATOR_SIZE 1
 #define END_INDICATOR_SIZE 1