diff --git a/src/fortheck/error.gleam b/src/fortheck/error.gleam
deleted file mode 100644
index f1ee495..0000000
--- a/src/fortheck/error.gleam
+++ /dev/null
@@ -1,4 +0,0 @@
-pub type Error {
-  StackOverflow
-  StackUnderflow
-}
diff --git a/src/fortheck/stack.gleam b/src/fortheck/stack.gleam
index 69bedf7..2610f1d 100644
--- a/src/fortheck/stack.gleam
+++ b/src/fortheck/stack.gleam
@@ -1,8 +1,12 @@
-import fortheck/error.{type Error, StackOverflow, StackUnderflow}
 import gleam/bool
 import gleam/list
 import gleam/result
 
+pub type Error {
+  StackOverflow
+  StackUnderflow
+}
+
 pub opaque type Stack(a) {
   Stack(capacity: Int, length: Int, data: List(a))
 }
diff --git a/test/fortheck/stack_test.gleam b/test/fortheck/stack_test.gleam
index a17a552..1b17cce 100644
--- a/test/fortheck/stack_test.gleam
+++ b/test/fortheck/stack_test.gleam
@@ -1,5 +1,4 @@
-import fortheck/error
-import fortheck/stack
+import fortheck/stack.{type Error, StackOverflow, StackUnderflow}
 import gleam/iterator
 import gleam/pair
 import gleam/result
@@ -32,7 +31,7 @@ pub fn push_stack_overflow_test() {
   |> should.be_ok
   |> stack.push(1)
   |> should.be_error
-  |> should.equal(error.StackOverflow)
+  |> should.equal(StackOverflow)
 }
 
 pub fn from_list_test() {
@@ -47,7 +46,7 @@ pub fn pop_stack_underflow_test() {
   stack.new()
   |> stack.pop
   |> should.be_error
-  |> should.equal(error.StackUnderflow)
+  |> should.equal(StackUnderflow)
 }
 
 pub fn pop_test() {
@@ -74,5 +73,5 @@ pub fn pop_2_stack_underflow_test() {
   stack.from_list([1])
   |> result.try(stack.pop_2)
   |> should.be_error
-  |> should.equal(error.StackUnderflow)
+  |> should.equal(StackUnderflow)
 }