diff --git a/src/CommonSubexpressions.jl b/src/CommonSubexpressions.jl
index 00823c2..5ae6c3e 100644
--- a/src/CommonSubexpressions.jl
+++ b/src/CommonSubexpressions.jl
@@ -40,6 +40,8 @@ const standard_expression_forms = Set{Symbol}(
      :for,
      :ref,
      :macrocall,
+     :vcat,
+     :row,
      Symbol("'")))
 
 const assignment_expression_forms = Set{Symbol}(