diff --git a/servers/slapd/slap.h b/servers/slapd/slap.h
index 912a97c596..a51bca022b 100644
--- a/servers/slapd/slap.h
+++ b/servers/slapd/slap.h
@@ -22,6 +22,9 @@
 #include "lthread.h"
 #include "lthread_rdwr.h"
 #include "ldif.h"
+#ifdef f_next
+#undef f_next /* name conflict between sys/file.h on SCO and struct filter */
+#endif
 
 #define DN_DNS	0
 #define DN_X500	1