diff --git a/lib/typeprof/core/ast.rb b/lib/typeprof/core/ast.rb
index da9c3130..0abb9ebb 100644
--- a/lib/typeprof/core/ast.rb
+++ b/lib/typeprof/core/ast.rb
@@ -249,7 +249,8 @@ def self.create_target_node(raw_node, lenv)
         LocalVariableWriteNode.new(raw_node, dummy_node, lenv)
       when :instance_variable_target_node
         InstanceVariableWriteNode.new(raw_node, dummy_node, lenv)
-      #when :class_variable_target_node
+      when :class_variable_target_node
+        ClassVariableWriteNode.new(raw_node, dummy_node, lenv)
       when :global_variable_target_node
         GlobalVariableWriteNode.new(raw_node, dummy_node, lenv)
       when :constant_target_node
diff --git a/scenario/variable/masgn.rb b/scenario/variable/masgn.rb
index 47fe370b..a04383a2 100644
--- a/scenario/variable/masgn.rb
+++ b/scenario/variable/masgn.rb
@@ -24,4 +24,4 @@ def bar: -> Integer?
 end
 
 ## update
-x, C, C::D::E, @iv, $gv, ary[0], foo.bar = 1, 2, 3, 4, 5, 6, 7
+x, C, C::D::E, @iv, @@cv, $gv, ary[0], foo.bar = 1, 2, 3, 4, 5, 6, 7, 8