diff --git a/cache.h b/cache.h
index 85b544f38d..9cda46e07b 100644
--- a/cache.h
+++ b/cache.h
@@ -391,7 +391,6 @@ extern int is_bare_repository(void);
 extern int is_inside_git_dir(void);
 extern char *git_work_tree_cfg;
 extern int is_inside_work_tree(void);
-extern int have_git_dir(void);
 extern const char *get_git_dir(void);
 extern int is_git_directory(const char *path);
 extern char *get_object_directory(void);
diff --git a/environment.c b/environment.c
index 378254c77a..0a15349cfe 100644
--- a/environment.c
+++ b/environment.c
@@ -155,11 +155,6 @@ int is_bare_repository(void)
 	return is_bare_repository_cfg && !get_git_work_tree();
 }
 
-int have_git_dir(void)
-{
-	return !!git_dir;
-}
-
 const char *get_git_dir(void)
 {
 	if (!git_dir)