ANSIfy as many declarations as possible.
diff --git a/Python/frozenmain.c b/Python/frozenmain.c
index f846c2d..576baac 100644
--- a/Python/frozenmain.c
+++ b/Python/frozenmain.c
@@ -13,9 +13,9 @@
 #include "Python.h"
 
 #ifdef MS_WIN32
-extern void PyWinFreeze_ExeInit();
-extern void PyWinFreeze_ExeTerm();
-extern int PyInitFrozenExtensions();
+extern void PyWinFreeze_ExeInit(void);
+extern void PyWinFreeze_ExeTerm(void);
+extern int PyInitFrozenExtensions(void);
 #endif
 
 #ifdef HAVE_UNISTD_H