diff --git a/src/Mod/Fem/femtools/tokrules.py b/src/Mod/Fem/femtools/tokrules.py
index f96cf6f454..0acf97f440 100644
--- a/src/Mod/Fem/femtools/tokrules.py
+++ b/src/Mod/Fem/femtools/tokrules.py
@@ -153,4 +153,4 @@ def p_error(p):
 
 
 import ply.yacc as yacc
-yacc.yacc()
+yacc.yacc(debug=False, write_tables=False)