diff --git a/sleepyhead/SleepLib/schema.cpp b/sleepyhead/SleepLib/schema.cpp
index 1980f2f1..37219b65 100644
--- a/sleepyhead/SleepLib/schema.cpp
+++ b/sleepyhead/SleepLib/schema.cpp
@@ -305,7 +305,7 @@ void init()
     ZEO_TimeToZ=schema::channel["TimeToZ"].id();
 }
 
-Channel::Channel(int id, ChanType type, ScopeType scope, QString code, QString fullname, QString description, QString label, QString unit, DataType datatype, QColor color, int link):
+Channel::Channel(ChannelID id, ChanType type, ScopeType scope, QString code, QString fullname, QString description, QString label, QString unit, DataType datatype, QColor color, int link):
     m_id(id),
     m_type(type),
     m_scope(scope),
diff --git a/sleepyhead/SleepLib/schema.h b/sleepyhead/SleepLib/schema.h
index 07f77c74..6fe8e341 100644
--- a/sleepyhead/SleepLib/schema.h
+++ b/sleepyhead/SleepLib/schema.h
@@ -53,7 +53,7 @@ class Channel
 {
 public:
     Channel() { m_id=0; }
-    Channel(int id, ChanType type, ScopeType scope, QString code, QString fullname, QString description, QString label, QString unit,DataType datatype=DEFAULT, QColor=Qt::black, int link=0);
+    Channel(ChannelID id, ChanType type, ScopeType scope, QString code, QString fullname, QString description, QString label, QString unit,DataType datatype=DEFAULT, QColor=Qt::black, int link=0);
     void addColor(Function f, QColor color) { m_colors[f]=color; }
     void addOption(int i, QString option) { m_options[i]=option; }