diff --git a/.gitignore b/.gitignore
index 608fdd3e74..37f7ea9c98 100644
--- a/.gitignore
+++ b/.gitignore
@@ -109,4 +109,7 @@ src/bonsai/bonsai/bim/schema/Brick.ttl
 bonsaiDecoratorForLoads.code-workspace
 dev_environment.bat
 
-.pixi/
\ No newline at end of file
+.pixi/
+
+src/ifcopenshell-python/ifcopenshell/express/*.exp
+src/ifcopenshell-python/ifcopenshell/express/*.exp.cache.dat