diff --git a/evutil.c b/evutil.c
index db827cfd..c326e5be 100644
--- a/evutil.c
+++ b/evutil.c
@@ -1483,6 +1483,13 @@ evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
 	r = _vsnprintf(buf, buflen, format, ap);
 	if (r < 0)
 		r = _vscprintf(format, ap);
+#elif defined(sgi)
+	/* Make sure we always use the correct vsnprintf on IRIX */
+	extern int      _xpg5_vsnprintf(char * __restrict,  
+		__SGI_LIBC_NAMESPACE_QUALIFIER size_t, 
+		const char * __restrict, /* va_list */ char *);
+	
+	r = _xpg5_vsnprintf(buf, buflen, format, ap); 
 #else
 	r = vsnprintf(buf, buflen, format, ap);
 #endif