diff --git a/environment.c b/environment.c
index ae1427bb9e..921ed89a2a 100644
--- a/environment.c
+++ b/environment.c
@@ -317,8 +317,8 @@ next_name:
 	return (current & ~negative) | positive;
 }
 
-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/environment.h b/environment.h
index 8cfce41015..862d0f50a4 100644
--- a/environment.h
+++ b/environment.h
@@ -106,6 +106,8 @@ const char *strip_namespace(const char *namespaced_ref);
 
 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);
 
 /*
  * TODO: All the below state either explicitly or implicitly relies on
diff --git a/setup.c b/setup.c
index 98ddbf377f..ff512074ff 100644
--- a/setup.c
+++ b/setup.c
@@ -2610,7 +2610,7 @@ int init_db(const char *git_dir, const char *real_git_dir,
 	 * have set up the repository format such that we can evaluate
 	 * includeIf conditions correctly in the case of re-initialization.
 	 */
-	repo_config(the_repository, platform_core_config, NULL);
+	repo_config(the_repository, git_default_core_config, NULL);
 
 	safe_create_dir(the_repository, git_dir, 0);