diff --git a/.gitignore b/.gitignore
index 5627e5f..b960bde 100644
--- a/.gitignore
+++ b/.gitignore
@@ -67,6 +67,12 @@ project.lock.json
 project.fragment.lock.json
 artifacts/
 
+# Coco/R generated parser/scanner output
+src/Core/cocor/Parser.cs
+src/Core/cocor/Parser.cs.old
+src/Core/cocor/Scanner.cs
+src/Core/cocor/Scanner.cs.old
+
 # ASP.NET Scaffolding
 ScaffoldingReadMe.txt