diff --git a/record/set.h b/record/set.h
index 74ddda75b..82a8e9ce5 100644
--- a/record/set.h
+++ b/record/set.h
@@ -51,6 +51,9 @@ from The Open Group.
     The following types and functions/macros define the ADT.
 */
 
+#ifndef XSERVER_SET_H
+#define XSERVER_SET_H
+
 /* an interval of set members */
 typedef struct {
     CARD16 first;
@@ -133,3 +136,5 @@ int RecordSetMemoryRequirements(RecordSetInterval * /*pIntervals */ ,
 	    process interval;
 	}
 */
+
+#endif /* XSERVER_SET_H */