diff --git a/e_os.h b/e_os.h
index 678e4d547025113992e54dfea13797bb441ab718..bbb1c304d6556c2e0d8a66dccb2b10484607dfe0 100644
--- a/e_os.h
+++ b/e_os.h
@@ -351,6 +351,9 @@ extern HINSTANCE _hInstance;
 #ifdef sgi
 #define IRIX_CC_BUG	/* all version of IRIX I've tested (4.* 5.*) */
 #endif
+#ifdef SNI
+#define IRIX_CC_BUG	/* CDS++ up to V2.0Bsomething suffered from the same bug.*/
+#endif
 
 #ifdef NO_MD2
 #define MD2_Init MD2Init