diff --git a/lib/security.c b/lib/security.c
index 01143938a5..cc2c917e99 100644
--- a/lib/security.c
+++ b/lib/security.c
@@ -66,6 +66,7 @@
 #include "sendf.h"
 #include "ftp.h"
 #include "memory.h"
+#include "strequal.h"
 
 /* The last #include file should be: */
 #include "memdebug.h"