diff --git a/servers/slapd/compare.c b/servers/slapd/compare.c
index abd1c2d426..7615323a5c 100644
--- a/servers/slapd/compare.c
+++ b/servers/slapd/compare.c
@@ -19,6 +19,7 @@
 
 #include <stdio.h>
 #include <ac/socket.h>
+#include <ac/string.h>
 
 #include "ldap_pvt.h"
 #include "slap.h"
diff --git a/servers/slapd/index.c b/servers/slapd/index.c
index 4ee3519442..e989d236c3 100644
--- a/servers/slapd/index.c
+++ b/servers/slapd/index.c
@@ -8,6 +8,7 @@
 #include "portable.h"
 
 #include <stdio.h>
+#include <ac/string.h>
 
 #include "slap.h"