diff --git a/cache.h b/cache.h
index 5006278c13..b7e20e9778 100644
--- a/cache.h
+++ b/cache.h
@@ -350,6 +350,7 @@ void add_name_hash(struct index_state *istate, struct cache_entry *ce);
 void remove_name_hash(struct index_state *istate, struct cache_entry *ce);
 void free_name_hash(struct index_state *istate);
 
+void ensure_full_index(struct index_state *istate);
 
 /* Cache entry creation and cleanup */
 
diff --git a/sparse-index.h b/sparse-index.h
index 39dcc85973..0268f38753 100644
--- a/sparse-index.h
+++ b/sparse-index.h
@@ -2,7 +2,6 @@
 #define SPARSE_INDEX_H__
 
 struct index_state;
-void ensure_full_index(struct index_state *istate);
 int convert_to_sparse(struct index_state *istate);
 
 struct repository;