diff --git a/cache.h b/cache.h
index 620b6a4ed4..fda3f8ec16 100644
--- a/cache.h
+++ b/cache.h
@@ -317,7 +317,7 @@ void datestamp(char *buf, int bufsize);
 unsigned long approxidate(const char *);
 
 extern int setup_ident(void);
-extern void ignore_missing_committer_name();
+extern void ignore_missing_committer_name(void);
 extern const char *git_author_info(int);
 extern const char *git_committer_info(int);
 
@@ -400,7 +400,7 @@ extern void install_packed_git(struct packed_git *pack);
 extern struct packed_git *find_sha1_pack(const unsigned char *sha1, 
 					 struct packed_git *packs);
 
-extern void pack_report();
+extern void pack_report(void);
 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, unsigned long, unsigned int *);
 extern void unuse_pack(struct pack_window **);
 extern struct packed_git *add_packed_git(char *, int, int);