diff --git a/src/ifcexpressparser/bootstrap.py b/src/ifcexpressparser/bootstrap.py
index badc70a690..7c67e956f4 100644
--- a/src/ifcexpressparser/bootstrap.py
+++ b/src/ifcexpressparser/bootstrap.py
@@ -175,6 +175,7 @@ else:
     
     %s
     
+    syntax.ignore("--" + restOfLine)
     syntax.ignore(Regex(r"\((?:\*(?:[^*]*\*+)+?\))"))
     ast = syntax.parseFile(sys.argv[1])
     schema = schema.Schema(ast)