diff --git a/cache-tree.c b/cache-tree.c
index 73cb340707..5f8ee87bb1 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -507,7 +507,7 @@ struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
 	return read_one(&buffer, &size);
 }
 
-struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
+static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
 {
 	while (*path) {
 		const char *slash;
diff --git a/cache-tree.h b/cache-tree.h
index 44aad426d3..cf8b790874 100644
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -28,8 +28,6 @@ struct cache_tree *cache_tree_read(const char *buffer, unsigned long size);
 int cache_tree_fully_valid(struct cache_tree *);
 int cache_tree_update(struct cache_tree *, struct cache_entry **, int, int, int);
 
-struct cache_tree *cache_tree_find(struct cache_tree *, const char *);
-
 #define WRITE_TREE_UNREADABLE_INDEX (-1)
 #define WRITE_TREE_UNMERGED_INDEX (-2)
 #define WRITE_TREE_PREFIX_ERROR (-3)