diff --git a/src/apprentice.c b/src/apprentice.c
index 10c09b9..9fb76be 100644
--- a/src/apprentice.c
+++ b/src/apprentice.c
@@ -40,6 +40,7 @@
 // {:bytes, binary()} :: same as :file
 // {:stop, reason :: atom()} :: exit 0
 
+#include <arpa/inet.h>
 #include <ei.h>
 #include <errno.h>
 #include <getopt.h>