--- a/extensions/auth/gssapi.h
+++ b/extensions/auth/gssapi.h
@@ -89,16 +89,20 @@
 #else
 #define EXTERN_C_BEGIN
 #define EXTERN_C_END
 #endif
 #endif
 
 EXTERN_C_BEGIN
 
+#if defined(XP_MACOSX)
+#    pragma pack(push,2)
+#endif
+
 /*
  * If the platform supports the xom.h header file, it should be
  * included here.
  */
 /* #include <xom.h> */
 
 
 /*
@@ -829,13 +833,16 @@ GSS_CALLCONV GSS_FUNC(gss_duplicate_name
                gss_ctx_id_t,       /* context_handle */
                gss_buffer_t,       /* input_message_buffer */
                gss_buffer_t,       /* output_message_buffer */
                int *,              /* conf_state */
                int *               /* qop_state */
               );
 
 
+#if defined(XP_MACOSX)
+#    pragma pack(pop)
+#endif
 
 EXTERN_C_END
 
 #endif /* GSSAPI_H_ */