diff --git a/source/adt/source/adt_set.c b/source/adt/source/adt_set.c
index ae2d3e80c..099fd8535 100644
--- a/source/adt/source/adt_set.c
+++ b/source/adt/source/adt_set.c
@@ -349,7 +349,7 @@ void set_iterate(set s, set_cb_iterate iterate_cb, set_cb_iterate_args args)
 	}
 }
 
-int set_append_cb_iterate(set s, set_key key, set_value value, set_cb_iterate_args args)
+static int set_append_cb_iterate(set s, set_key key, set_value value, set_cb_iterate_args args)
 {
 	set dest = (set)args;
 
@@ -367,7 +367,7 @@ int set_append(set dest, set src)
 	return 0;
 }
 
-int set_disjoint_cb_iterate(set s, set_key key, set_value value, set_cb_iterate_args args)
+static int set_disjoint_cb_iterate(set s, set_key key, set_value value, set_cb_iterate_args args)
 {
 	set dest = (set)args;
 
diff --git a/source/adt/source/adt_trie.c b/source/adt/source/adt_trie.c
index 36d039842..3ce07f632 100644
--- a/source/adt/source/adt_trie.c
+++ b/source/adt/source/adt_trie.c
@@ -114,15 +114,23 @@ struct trie_node_suffixes_iterator_args_type
 
 /* -- Private Methods -- */
 
-trie_node trie_node_get(trie t, vector keys);
+static trie_node trie_node_get(trie t, vector keys);
 
-trie_node trie_node_insert(trie t, trie_node parent, trie_key key, trie_value value);
+static trie_node trie_node_insert(trie t, trie_node parent, trie_key key, trie_value value);
 
-void trie_node_iterate_recursive(trie t, trie_node n, trie_cb_iterate iterate_cb, trie_cb_iterate_args args);
+static int trie_node_childs_cb_iterator(set s, set_key key, set_value value, set_cb_iterate_args args);
 
-void trie_node_iterate(trie t, trie_node n, trie_cb_iterate iterate_cb, trie_cb_iterate_args args);
+static void trie_node_iterate_recursive(trie t, trie_node n, trie_cb_iterate iterate_cb, trie_cb_iterate_args args);
 
-int trie_node_clear(trie t, trie_node n);
+static void trie_node_iterate(trie t, trie_node n, trie_cb_iterate iterate_cb, trie_cb_iterate_args args);
+
+static int trie_node_append_cb_iterator(trie t, trie_key key, trie_value value, trie_cb_iterate_args args);
+
+static int trie_node_clear(trie t, trie_node n);
+
+static trie_node trie_node_find(trie t, trie_key key);
+
+static int trie_node_suffixes_cb_iterator(trie t, trie_key key, trie_value value, trie_cb_iterate_args args);
 
 /* -- Methods -- */
 
diff --git a/source/adt/source/adt_vector.c b/source/adt/source/adt_vector.c
index 7137d9d1f..f31654a1b 100644
--- a/source/adt/source/adt_vector.c
+++ b/source/adt/source/adt_vector.c
@@ -45,7 +45,7 @@ struct vector_type
 *  @return
 *    A pointer to data vector memory block with offset @bytes
 */
-void * vector_data_offset_bytes(vector v, size_t bytes);
+static void * vector_data_offset_bytes(vector v, size_t bytes);
 
 /* -- Methods -- */