diff --git a/opm/input/eclipse/Schedule/Schedule.hpp b/opm/input/eclipse/Schedule/Schedule.hpp
index 3fc7e41ee..e3aca18ad 100644
--- a/opm/input/eclipse/Schedule/Schedule.hpp
+++ b/opm/input/eclipse/Schedule/Schedule.hpp
@@ -539,10 +539,7 @@ namespace Opm
             , grid(grid_)
             {}
 
-            void affected_well(const std::string& well_name) {
-                if (this->sim_update)
-                    this->sim_update->affected_wells.insert(well_name);
-            }
+            void affected_well(const std::string& well_name);
 
             /// \brief Mark that the well occured in a  WELSEGS keyword
             void welsegs_handled(const std::string& well_name)
diff --git a/src/opm/input/eclipse/Schedule/Schedule.cpp b/src/opm/input/eclipse/Schedule/Schedule.cpp
index 75a1e07d3..d49be7e3e 100644
--- a/src/opm/input/eclipse/Schedule/Schedule.cpp
+++ b/src/opm/input/eclipse/Schedule/Schedule.cpp
@@ -2273,4 +2273,10 @@ std::ostream& operator<<(std::ostream& os, const Schedule& sched)
     return os;
 }
 
+void Schedule::HandlerContext::affected_well(const std::string& well_name)
+{
+    if (this->sim_update)
+        this->sim_update->affected_wells.insert(well_name);
+}
+
 }