diff --git a/lib/libstand/zalloc_defs.h b/lib/libstand/zalloc_defs.h
index fda86c7eede8..b51b6b232182 100644
--- a/lib/libstand/zalloc_defs.h
+++ b/lib/libstand/zalloc_defs.h
@@ -59,6 +59,10 @@ typedef int saddr_t;		/* signed int same size as pointer	*/
 typedef unsigned long iaddr_t;	/* unsigned int same size as pointer	*/
 typedef long saddr_t;		/* signed int same size as pointer	*/
 #endif
+#ifdef __sparc64__
+typedef unsigned long iaddr_t;	/* unsigned long same size as pointer	*/
+typedef long saddr_t;		/* signed long same size as pointer	*/
+#endif
 
 #include "zalloc_mem.h"