diff --git a/Makefile.am b/Makefile.am
index 71695cfa..1a0f9158 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -75,6 +75,7 @@ monitor_iwmon_SOURCES = monitor/main.c linux/nl80211.h \
 					src/sha1.h src/sha1.c \
 					src/md5.h src/md5.c \
 					src/aes.h src/aes.c \
+					src/arc4.h src/arc4.c \
 					src/eapol.h src/eapol.c
 monitor_iwmon_LDADD = ell/libell-internal.la