diff --git a/Lib/plat-sunos5/STROPTS.py b/Lib/plat-sunos5/STROPTS.py
index e95db932d11..4970bd722d7 100644
--- a/Lib/plat-sunos5/STROPTS.py
+++ b/Lib/plat-sunos5/STROPTS.py
@@ -1550,7 +1550,7 @@ IE_NOMEM = -1
 AS_PAGLCK = 0x80
 AS_CLAIMGAP = 0x40
 AS_UNMAPWAIT = 0x20
-def AS_TYPE_64BIT(as): return \
+def AS_TYPE_64BIT(as_): return \
 
 AS_LREP_LINKEDLIST = 0
 AS_LREP_SKIPLIST = 1