diff --git a/Modules/config.c.in b/Modules/config.c.in
index 106b084..da7cabb 100644
--- a/Modules/config.c.in
+++ b/Modules/config.c.in
@@ -20,8 +20,8 @@
 
 /* -- ADDMODULE MARKER 1 -- */
 
-extern void PyMarshal_Init();
-extern void initimp();
+extern void PyMarshal_Init(void);
+extern void initimp(void);
 
 struct _inittab _PyImport_Inittab[] = {
 
diff --git a/Modules/makesetup b/Modules/makesetup
index 3da5323..c0c2712 100755
--- a/Modules/makesetup
+++ b/Modules/makesetup
@@ -23,7 +23,7 @@
 # Copying config.c.in to config.c:
 # - insert an identifying comment at the start
 # - for each <module> mentioned in Setup before *noconfig*:
-#   + insert 'extern void init<module>();' before MARKER 1
+#   + insert 'extern void init<module>(void);' before MARKER 1
 #   + insert '{"<module>", initmodule},' before MARKER 2
 #
 # Copying Makefile.pre to Makefile:
@@ -234,7 +234,7 @@
 	INITBITS=
 	for mod in $MODS
 	do
-		EXTDECLS="${EXTDECLS}extern void init$mod();$NL"
+		EXTDECLS="${EXTDECLS}extern void init$mod(void);$NL"
 		INITBITS="${INITBITS}	{\"$mod\", init$mod},$NL"
 	done