diff --git a/src/backend/concrete_environment.cc b/src/backend/concrete_environment.cc
index ee0a324..4f9488e 100644
--- a/src/backend/concrete_environment.cc
+++ b/src/backend/concrete_environment.cc
@@ -26,6 +26,7 @@
 #include "thread.hh"
 
 #include "deletor.tcc"
+#include "sequences.tcc"
 
 #include <algorithm>
 #include <cassert>
@@ -59,7 +60,7 @@ ConcreteEnvironment::ConcreteEnvironment(const ConcreteEnvironment& ce) :
   {
     const Processes& ce_proc = ce._processes;
     insert_iterator<Processes> dest(_processes, _processes.begin());
-    for (Processes::const_iterator orig = ce_proc.begin(); orig != ce_proc.end(); orig++)
+    for (Iseq<Processes::const_iterator> orig = iseq(ce_proc); orig; orig++)
       *dest++ = new DynamicProcess(dynamic_cast<const DynamicProcess&>(**orig));
   }
 
diff --git a/src/text_simulation.cc b/src/text_simulation.cc
index ef662f3..eb8db4d 100644
--- a/src/text_simulation.cc
+++ b/src/text_simulation.cc
@@ -1623,7 +1623,7 @@ TextSimulation::update(const History& changed_history)
   oss.str(string());
 
  
-  // Set new format state flags, and save the old one
+  // Set new format fillers
   static const unsigned int fill0 = 25;
   static const unsigned int fill1 = 15;