diff --git a/opm/core/wells/WellsManager.cpp b/opm/core/wells/WellsManager.cpp
index 95cb0369a..fa142309e 100644
--- a/opm/core/wells/WellsManager.cpp
+++ b/opm/core/wells/WellsManager.cpp
@@ -223,6 +223,10 @@ namespace Opm
         : w_(0)
     {
     }
+    WellsManager::WellsManager(struct Wells* W)
+        : w_(W)
+    {
+    }
 
 
 
diff --git a/opm/core/wells/WellsManager.hpp b/opm/core/wells/WellsManager.hpp
index 6df65ec41..650eaf371 100644
--- a/opm/core/wells/WellsManager.hpp
+++ b/opm/core/wells/WellsManager.hpp
@@ -41,7 +41,10 @@ namespace Opm
     {
     public:
 	/// Default constructor -- no wells.
-	WellsManager();
+    WellsManager();
+    /// Construct from mrst type output.
+    /// Wellmanger is not properly initialized
+    WellsManager(struct Wells* W);
 
 	/// Construct from input deck and grid.
 	/// The permeability argument may be zero if the input contain