diff --git a/Python/modsupport.c b/Python/modsupport.c
index 8b47296..9f7a5b5 100644
--- a/Python/modsupport.c
+++ b/Python/modsupport.c
@@ -417,7 +417,10 @@
 }
 
 static object *
-do_mkvalue(p_format, p_va) {
+do_mkvalue(p_format, p_va)
+	char **p_format;
+	va_list *p_va;
+{
 	
 	switch (*(*p_format)++) {