diff --git a/lib/typeprof/analyzer.rb b/lib/typeprof/analyzer.rb
index ccfc9bcda..c10c3c4a9 100644
--- a/lib/typeprof/analyzer.rb
+++ b/lib/typeprof/analyzer.rb
@@ -286,6 +286,7 @@ def initialize
       @anonymous_struct_gen_id = 0
 
       @types_being_shown = []
+      @namespace = nil
     end
 
     def add_entrypoint(iseq)