diff --git a/cache.h b/cache.h
index 5d7463e6fb..281f00ab1b 100644
--- a/cache.h
+++ b/cache.h
@@ -350,8 +350,6 @@ 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 */
 
 /*