diff --git a/lib/gssapi/gssapi.h b/lib/gssapi/gssapi.h
index 321ec5c9c..c5fa61abb 100644
--- a/lib/gssapi/gssapi.h
+++ b/lib/gssapi/gssapi.h
@@ -33,5 +33,9 @@
 
 /* $Id$ */
 
+#ifndef GSSAPI_H_
+#define GSSAPI_H_
+
 #include <gssapi/gssapi.h>
 
+#endif