diff --git a/config.c b/config.c
index ae3652b08f..9523cc858f 100644
--- a/config.c
+++ b/config.c
@@ -1374,8 +1374,8 @@ int git_config_color(char *dest, const char *var, const char *value)
 	return 0;
 }
 
-static int git_default_core_config(const char *var, const char *value,
-				   const struct config_context *ctx, void *cb)
+int git_default_core_config(const char *var, const char *value,
+			    const struct config_context *ctx, void *cb)
 {
 	/* This needs a better name */
 	if (!strcmp(var, "core.filemode")) {
diff --git a/config.h b/config.h
index f4966e3749..4846f0be15 100644
--- a/config.h
+++ b/config.h
@@ -167,6 +167,8 @@ typedef int (*config_fn_t)(const char *, const char *,
 
 int git_default_config(const char *, const char *,
 		       const struct config_context *, void *);
+int git_default_core_config(const char *var, const char *value,
+			    const struct config_context *ctx, void *cb);
 
 /**
  * Read a specific file in git-config format.
diff --git a/setup.c b/setup.c
index 30f243fc32..daea9f8a52 100644
--- a/setup.c
+++ b/setup.c
@@ -2287,7 +2287,7 @@ int init_db(const char *git_dir, const char *real_git_dir,
 	startup_info->have_repository = 1;
 
 	/* Ensure `core.hidedotfiles` is processed */
-	git_config(platform_core_config, NULL);
+	git_config(git_default_core_config, NULL);
 
 	safe_create_dir(git_dir, 0);