diff --git a/src/libply/ply-hashtable.c b/src/libply/ply-hashtable.c
index 3e155ada..92e9ce7f 100644
--- a/src/libply/ply-hashtable.c
+++ b/src/libply/ply-hashtable.c
@@ -123,7 +123,7 @@ ply_hashtable_free (ply_hashtable_t *hashtable)
 }
 
 
-void
+static void
 ply_hashtable_insert_internal (ply_hashtable_t *hashtable,
                                void            *key,
                                void            *data)