diff --git a/pkg/io/io.go b/pkg/io/io.go
index 7c5299e6..2b573c4d 100644
--- a/pkg/io/io.go
+++ b/pkg/io/io.go
@@ -1,7 +1,7 @@
 package io
 
 import (
-	"errors"
+	"os"
 
 	coreerr "github.com/host-uk/core/pkg/framework/core"
 	"github.com/host-uk/core/pkg/io/local"
@@ -104,7 +104,7 @@ func NewMockMedium() *MockMedium {
 func (m *MockMedium) Read(path string) (string, error) {
 	content, ok := m.Files[path]
 	if !ok {
-		return "", coreerr.E("io.MockMedium.Read", "file not found: "+path, errors.New("file not found"))
+		return "", coreerr.E("io.MockMedium.Read", "file not found: "+path, os.ErrNotExist)
 	}
 	return content, nil
 }