diff --git a/src/runtime/c/pgf/linearizer.cxx b/src/runtime/c/pgf/linearizer.cxx
index bd6925165..5cb7d5901 100644
--- a/src/runtime/c/pgf/linearizer.cxx
+++ b/src/runtime/c/pgf/linearizer.cxx
@@ -300,6 +300,11 @@ void PgfLinearizer::TreeLinNode::linearize(PgfLinearizationOutputIface *out, Pgf
     }
 }
 
+ref<PgfConcrLincat> PgfLinearizer::TreeLinNode::get_lincat(PgfLinearizer *linearizer)
+{
+    return namespace_lookup(linearizer->concr->lincats, &lin->absfun->type->name);
+}
+
 PgfLinearizer::TreeLindefNode::TreeLindefNode(PgfLinearizer *linearizer, PgfText *literal)
   : TreeNode(linearizer)
 {
@@ -310,10 +315,15 @@ PgfLinearizer::TreeLindefNode::TreeLindefNode(PgfLinearizer *linearizer, PgfText
 
 bool PgfLinearizer::TreeLindefNode::resolve(PgfLinearizer *linearizer)
 {
-    ref<PgfPResult> pres = *vector_elem(lincat->res,  lin_index);
-    value = eval_param(&pres->param);
-    lin_index++;
-    return true;
+    if (lincat == 0) {
+        lin_index++;
+        return (lin_index <= 1);
+    } else {
+        ref<PgfPResult> pres = *vector_elem(lincat->res,  lin_index);
+        value = eval_param(&pres->param);
+        lin_index++;
+        return (lin_index <= lincat->n_lindefs);
+    }
 }
 
 void PgfLinearizer::TreeLindefNode::check_category(PgfLinearizer *linearizer, PgfText *cat)
@@ -366,6 +376,42 @@ void PgfLinearizer::TreeLindefNode::linearize(PgfLinearizationOutputIface *out,
     }
 }
 
+ref<PgfConcrLincat> PgfLinearizer::TreeLindefNode::get_lincat(PgfLinearizer *linearizer)
+{
+    return lincat;
+}
+
+PgfLinearizer::TreeLinrefNode::TreeLinrefNode(PgfLinearizer *linearizer, TreeNode *root)
+  : TreeNode(linearizer)
+{
+    args = root;
+    lin_index=0;
+}
+
+bool PgfLinearizer::TreeLinrefNode::resolve(PgfLinearizer *linearizer)
+{
+    ref<PgfConcrLincat> lincat = args->get_lincat(linearizer);
+    lin_index++;
+    return (lincat->n_lindefs+lin_index <= lincat->res->len);
+}
+
+void PgfLinearizer::TreeLinrefNode::linearize(PgfLinearizationOutputIface *out, PgfLinearizer *linearizer, size_t lindex)
+{
+    ref<PgfConcrLincat> lincat = args->get_lincat(linearizer);
+    if (lincat != 0) {
+        size_t i = lincat->n_lindefs*lincat->fields->len + (lin_index-1);
+        ref<Vector<PgfSymbol>> syms = *vector_elem(lincat->seqs, i);
+        linearize_syms(out, linearizer, syms);
+    } else {
+        args->linearize(out, linearizer, lindex);
+    }
+}
+
+ref<PgfConcrLincat> PgfLinearizer::TreeLinrefNode::get_lincat(PgfLinearizer *linearizer)
+{
+    return 0;
+}
+
 PgfLinearizer::TreeLitNode::TreeLitNode(PgfLinearizer *linearizer, ref<PgfConcrLincat> lincat, PgfText *lit)
   : TreeNode(linearizer)
 {
@@ -395,6 +441,11 @@ void PgfLinearizer::TreeLitNode::linearize(PgfLinearizationOutputIface *out, Pgf
         out->end_phrase(&lincat->name, fid, field, linearizer->wild);
 }
 
+ref<PgfConcrLincat> PgfLinearizer::TreeLitNode::get_lincat(PgfLinearizer *linearizer)
+{
+    return lincat;
+}
+
 PgfLinearizer::PgfLinearizer(ref<PgfConcr> concr, PgfMarshaller *m) {
     this->concr = concr;
     this->m = m;
@@ -449,6 +500,8 @@ bool PgfLinearizer::resolve()
 
 void PgfLinearizer::reverse_and_label()
 {
+    new TreeLinrefNode(this, root);
+
     // Reverse the list of nodes and label them with fid;
     int fid = 0;
     TreeNode *node = root;
diff --git a/src/runtime/c/pgf/linearizer.h b/src/runtime/c/pgf/linearizer.h
index 7dc67d877..7df80cac8 100644
--- a/src/runtime/c/pgf/linearizer.h
+++ b/src/runtime/c/pgf/linearizer.h
@@ -41,6 +41,7 @@ class PGF_INTERNAL_DECL PgfLinearizer : public PgfUnmarshaller {
         virtual void linearize_syms(PgfLinearizationOutputIface *out, PgfLinearizer *linearizer, ref<Vector<PgfSymbol>> syms);
         virtual void linearize(PgfLinearizationOutputIface *out, PgfLinearizer *linearizer, size_t lindex)=0;
         size_t eval_param(PgfLParam *param);
+        virtual ref<PgfConcrLincat> get_lincat(PgfLinearizer *linearizer)=0;
         virtual ~TreeNode() { free(var_values); };
     };
 
@@ -52,6 +53,7 @@ class PGF_INTERNAL_DECL PgfLinearizer : public PgfUnmarshaller {
         virtual bool resolve(PgfLinearizer *linearizer);
         virtual void check_category(PgfLinearizer *linearizer, PgfText *cat);
         virtual void linearize(PgfLinearizationOutputIface *out, PgfLinearizer *linearizer, size_t lindex);
+        virtual ref<PgfConcrLincat> get_lincat(PgfLinearizer *linearizer);
     };
 
     struct TreeLindefNode : public TreeNode {
@@ -64,9 +66,20 @@ class PGF_INTERNAL_DECL PgfLinearizer : public PgfUnmarshaller {
         virtual void check_category(PgfLinearizer *linearizer, PgfText *cat);
         virtual void linearize_arg(PgfLinearizationOutputIface *out, PgfLinearizer *linearizer, size_t d, PgfLParam *r);
         virtual void linearize(PgfLinearizationOutputIface *out, PgfLinearizer *linearizer, size_t lindex);
+        virtual ref<PgfConcrLincat> get_lincat(PgfLinearizer *linearizer);
         ~TreeLindefNode() { free(literal); };
     };
 
+    struct TreeLinrefNode : public TreeNode {
+        size_t lin_index;
+
+        TreeLinrefNode(PgfLinearizer *linearizer, TreeNode *root);
+        virtual bool resolve(PgfLinearizer *linearizer);
+        virtual void check_category(PgfLinearizer *linearizer, PgfText *cat) {};
+        virtual void linearize(PgfLinearizationOutputIface *out, PgfLinearizer *linearizer, size_t lindex);
+        virtual ref<PgfConcrLincat> get_lincat(PgfLinearizer *linearizer);
+    };
+
     struct TreeLitNode : public TreeNode {
         ref<PgfConcrLincat> lincat;
         PgfText *literal;
@@ -74,6 +87,7 @@ class PGF_INTERNAL_DECL PgfLinearizer : public PgfUnmarshaller {
         TreeLitNode(PgfLinearizer *linearizer, ref<PgfConcrLincat> lincat, PgfText *lit);
         virtual void check_category(PgfLinearizer *linearizer, PgfText *cat);
         virtual void linearize(PgfLinearizationOutputIface *out, PgfLinearizer *linearizer, size_t lindex);
+        virtual ref<PgfConcrLincat> get_lincat(PgfLinearizer *linearizer);
         ~TreeLitNode() { free(literal); };
     };