diff --git a/artiq/compiler/tools.py b/artiq/compiler/tools.py
index 63911bc54..988d46468 100644
--- a/artiq/compiler/tools.py
+++ b/artiq/compiler/tools.py
@@ -4,4 +4,4 @@ def eval_ast(expr, symdict=dict()):
 	if not isinstance(expr, ast.Expression):
 		expr = ast.Expression(expr)
 	code = compile(expr, "<ast>", "eval")
-	return eval(code, symdict)#
+	return eval(code, symdict)