diff --git a/PScope.h b/PScope.h
index b9118d7ff..6a22ac51f 100644
--- a/PScope.h
+++ b/PScope.h
@@ -57,7 +57,8 @@ class LexicalScope {
       enum lifetime_t { INHERITED, STATIC, AUTOMATIC };
 
       explicit LexicalScope(LexicalScope*parent)
-        : default_lifetime(INHERITED), generate_counter(0), parent_(parent) { }
+        : default_lifetime(INHERITED), has_parameter_port_list(false),
+	  generate_counter(0), parent_(parent) { }
 	// A virtual destructor is so that dynamic_cast can work.
       virtual ~LexicalScope() { }