diff --git a/libwccl/parser/grammar.g b/libwccl/parser/grammar.g
index bc576529b04eb89e700a4cf91204d20d017841b8..1443d7e96922f28cb3bce9f4d7038b92fed40820 100644
--- a/libwccl/parser/grammar.g
+++ b/libwccl/parser/grammar.g
@@ -631,7 +631,7 @@ op_orth
 ;
 // ----------------------------------------------------------------------------
 op_base 
-	[const Corpus2::Tagset& tagset, Wccl::Variables& vars]
+	[const Corpus2::Tagset& /*tagset*/, Wccl::Variables& vars]
 	returns [boost::shared_ptr<Wccl::Function<Wccl::StrSet> > ret]
 {
 	boost::shared_ptr<Wccl::VarGetter<Wccl::Position> > pos;
@@ -678,7 +678,7 @@ op_affix
 ;
 // ----------------------------------------------------------------------------
 op_str_set
-	[const Corpus2::Tagset& tagset, Wccl::Variables& vars]
+	[const Corpus2::Tagset& /*tagset*/, Wccl::Variables& vars]
 	returns [boost::shared_ptr<Wccl::Function<Wccl::StrSet> > op]
 	: op = str_set_variable [vars]
 	| op = str_set_value 
@@ -793,7 +793,7 @@ lpred_nor
 ;
 // ----------------------------------------------------------------------------
 lpred_bool
-	[const Corpus2::Tagset& tagset, Wccl::Variables& vars]
+	[const Corpus2::Tagset& /*tagset*/, Wccl::Variables& vars]
 	returns [boost::shared_ptr<Wccl::Function<Wccl::Bool> > op]
 	: op = boolean_variable [vars]
 	| op = boolean_value