diff --git a/src/ldapauth.c b/src/ldapauth.c
index c5a300c..a48b595 100644
--- a/src/ldapauth.c
+++ b/src/ldapauth.c
@@ -1,3 +1,4 @@
+#include <assert.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>