diff --git a/include/HYCOM.h b/include/HYCOM.h
index 122cc97..fb38499 100644
--- a/include/HYCOM.h
+++ b/include/HYCOM.h
@@ -43,6 +43,6 @@ class HYCOMData: public LayeredData
    return "Unknown dataset: " + dataset;
 
   SetTitle(DataTitle());
-  return LayeredData::Open(args, dataset);
+  return LayeredData::Open(dataset);
  }
 };
diff --git a/include/NEMO.h b/include/NEMO.h
index d2b4d55..688ae54 100644
--- a/include/NEMO.h
+++ b/include/NEMO.h
@@ -43,6 +43,6 @@ class NEMOData: public LayeredData
    return "Unknown dataset: " + dataset;
 
   SetTitle(DataTitle());
-  return LayeredData::Open(args, dataset);
+  return LayeredData::Open(dataset);
  }
 };
diff --git a/include/layereddata.h b/include/layereddata.h
index ab72d2f..a69d97e 100644
--- a/include/layereddata.h
+++ b/include/layereddata.h
@@ -77,7 +77,7 @@ class LayeredData
  };
 
  // TODO: RetVal
- MString Open(const CLArgs& args, const MString& dataset);
+ MString Open(const MString& dataset);
 
  void SetTitle(const MString& newtitle) { title = newtitle; }
 
diff --git a/src/layereddata.cpp b/src/layereddata.cpp
index 35d31d3..3dea72a 100644
--- a/src/layereddata.cpp
+++ b/src/layereddata.cpp
@@ -42,7 +42,7 @@ MString LayeredData::Info() const
  // clang-format on
 }
 
-MString LayeredData::Open(const CLArgs& args, const MString& dataset)
+MString LayeredData::Open(const MString& dataset)
 {
  nc.clear();
  MString proxyurl = GPL.ParameterSValue("USEPROXY", "");