diff --git a/builtin/checkout.c b/builtin/checkout.c
index 9771c848c5..c6e29e9526 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -124,24 +124,6 @@ static void branch_info_release(struct branch_info *info)
 	free(info->checkout);
 }
 
-static int post_checkout_hook(struct commit *old_commit, struct commit *new_commit,
-			      int changed)
-{
-	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT_FORCE_SERIAL;
-
-	/*
-	 * "new_commit" can be NULL when checking out from the index before
-	 * a commit exists.
-	 */
-	strvec_pushl(&opt.args,
-		     oid_to_hex(old_commit ? &old_commit->object.oid : null_oid(the_hash_algo)),
-		     oid_to_hex(new_commit ? &new_commit->object.oid : null_oid(the_hash_algo)),
-		     changed ? "1" : "0",
-		     NULL);
-
-	return run_hooks_opt(the_repository, "post-checkout", &opt);
-}
-
 /*
  * Handle a tree object and determine if we need to recurse into the
  * tree (READ_TREE_RECURSIVE) or skip it (0).
@@ -718,7 +700,7 @@ static int checkout_paths(const struct checkout_opts *opts,
 			   &rev, NULL);
 	head = lookup_commit_reference_gently(the_repository, &rev, 1);
 
-	errs |= post_checkout_hook(head, head, 0);
+	errs |= post_checkout_hook(the_repository, head, head, 0);
 	return errs;
 }
 
@@ -1273,7 +1255,8 @@ static int switch_branches(const struct checkout_opts *opts,
 		}
 	}
 
-	ret = post_checkout_hook(old_branch_info.commit, new_branch_info->commit, 1);
+	ret = post_checkout_hook(the_repository,
+				 old_branch_info.commit, new_branch_info->commit, 1);
 	branch_info_release(&old_branch_info);
 	strbuf_release(&old_commit_shortname);
 	strbuf_release(&autostash_msg);
diff --git a/checkout.c b/checkout.c
index 1588b116ee..28c5c18d96 100644
--- a/checkout.c
+++ b/checkout.c
@@ -1,6 +1,9 @@
 #define USE_THE_REPOSITORY_VARIABLE
 
 #include "git-compat-util.h"
+#include "commit.h"
+#include "hex.h"
+#include "hook.h"
 #include "object-name.h"
 #include "remote.h"
 #include "refspec.h"
@@ -8,6 +11,7 @@
 #include "checkout.h"
 #include "config.h"
 #include "strbuf.h"
+#include "strvec.h"
 
 struct tracking_name_data {
 	/* const */ char *src_ref;
@@ -73,3 +77,27 @@ char *unique_tracking_name(const char *name, struct object_id *oid,
 	}
 	return NULL;
 }
+
+int post_checkout_hook(struct repository *repo,
+		       struct commit *old_commit, struct commit *new_commit,
+		       int changed)
+{
+	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT_FORCE_SERIAL;
+	const struct git_hash_algo *hash_algo = repo->hash_algo;
+
+	/*
+	 * "new_commit" can be NULL when checking out from the index before
+	 * a commit exists.
+	 */
+	strvec_pushl(&opt.args,
+		     oid_to_hex(old_commit
+				? &old_commit->object.oid
+				: null_oid(hash_algo)),
+		     oid_to_hex(new_commit ?
+				&new_commit->object.oid
+				: null_oid(hash_algo)),
+		     changed ? "1" : "0",
+		     NULL);
+
+	return run_hooks_opt(repo, "post-checkout", &opt);
+}
diff --git a/checkout.h b/checkout.h
index 55920e7aeb..6d8d2c2bab 100644
--- a/checkout.h
+++ b/checkout.h
@@ -3,6 +3,9 @@
 
 #include "hash.h"
 
+struct commit;
+struct repository;
+
 /*
  * Check if the branch name uniquely matches a branch name on a remote
  * tracking branch.  Return the name of the remote if such a branch
@@ -12,4 +15,11 @@ char *unique_tracking_name(const char *name,
 			   struct object_id *oid,
 			   int *dwim_remotes_matched);
 
+/*
+ * Run the post-checkout hook.
+ */
+int post_checkout_hook(struct repository *,
+		       struct commit *old_commit, struct commit *new_commit,
+		       int changed);
+
 #endif /* CHECKOUT_H */