diff --git a/lib/telnet.c b/lib/telnet.c
index 3b5e1d761826b894f7fc418036376dca788b3d14..6200445878ad3585c6e17c1fb74436f42b1acbff 100644
--- a/lib/telnet.c
+++ b/lib/telnet.c
@@ -76,6 +76,7 @@
 #include "arpa_telnet.h"
 #include "memory.h"
 #include "select.h"
+#include "strequal.h"
 
 /* The last #include file should be: */
 #include "memdebug.h"