diff --git a/exercises/concept/erlang-extraction/src/erlang_extraction.gleam b/exercises/concept/erlang-extraction/src/erlang_extraction.gleam
index beadcdfcd..e22a2966e 100644
--- a/exercises/concept/erlang-extraction/src/erlang_extraction.gleam
+++ b/exercises/concept/erlang-extraction/src/erlang_extraction.gleam
@@ -8,10 +8,10 @@ pub fn insert(tree: GbTree(k, v), key: k, value: v) -> GbTree(k, v) {
   todo
 }
 
-pub fn delete(tree: GbTree(k, v), key: k) -> GbTree(k, v) {
+fn do_insert(key: k, value: v, tree: GbTree(k, v)) -> GbTree(k, v) {
   todo
 }
 
-fn do_delete(key: k, tree: GbTree(k, v)) -> GbTree(k, v) {
+pub fn delete(tree: GbTree(k, v), key: k) -> GbTree(k, v) {
   todo
 }