diff --git a/lib/ecl/ecl_sum.c b/lib/ecl/ecl_sum.c
index 5d96892978..13ad14dc46 100644
--- a/lib/ecl/ecl_sum.c
+++ b/lib/ecl/ecl_sum.c
@@ -1426,3 +1426,16 @@ time_t_vector_type * ecl_sum_alloc_time_solution( const ecl_sum_type * ecl_sum ,
 ert_ecl_unit_enum ecl_sum_get_unit_system(const ecl_sum_type * ecl_sum) {
   return ecl_smspec_get_unit_system(ecl_sum->smspec);
 }
+
+double ecl_sum_iget_last_value(const ecl_sum_type * ecl_sum, int param_index) {
+  return ecl_sum_data_get_last_value(ecl_sum->data, param_index);
+}
+
+double ecl_sum_get_last_value_gen_key(const ecl_sum_type * ecl_sum, const char * gen_key) {
+  const smspec_node_type * node = ecl_sum_get_general_var_node( ecl_sum , gen_key );
+  return ecl_sum_iget_last_value(ecl_sum, smspec_node_get_params_index(node));
+}
+
+double ecl_sum_get_last_value_node(const ecl_sum_type * ecl_sum, const smspec_node_type *node) {
+  return ecl_sum_iget_last_value(ecl_sum, smspec_node_get_params_index(node));
+}
diff --git a/lib/ecl/ecl_sum_data.c b/lib/ecl/ecl_sum_data.c
index 6f38d91f21..38480568ab 100644
--- a/lib/ecl/ecl_sum_data.c
+++ b/lib/ecl/ecl_sum_data.c
@@ -1487,3 +1487,9 @@ bool ecl_sum_data_report_step_compatible( const ecl_sum_data_type * data1 , cons
   }
   return compatible;
 }
+
+
+double ecl_sum_data_get_last_value(const ecl_sum_data_type * data, int param_index) {
+  const ecl_sum_tstep_type * tstep = vector_get_last_const(data->data);
+  return ecl_sum_tstep_iget( tstep, param_index);
+}
diff --git a/lib/include/ert/ecl/ecl_sum.h b/lib/include/ert/ecl/ecl_sum.h
index 00d959bfd7..49835013e6 100644
--- a/lib/include/ert/ecl/ecl_sum.h
+++ b/lib/include/ert/ecl/ecl_sum.h
@@ -265,6 +265,10 @@ typedef struct ecl_sum_struct       ecl_sum_type;
   double_vector_type * ecl_sum_alloc_days_solution( const ecl_sum_type * ecl_sum , const char * gen_key , double cmp_value , bool rates_clamp_lower);
   time_t_vector_type * ecl_sum_alloc_time_solution( const ecl_sum_type * ecl_sum , const char * gen_key , double cmp_value , bool rates_clamp_lower);
 
+  double               ecl_sum_iget_last_value(const ecl_sum_type * ecl_sum, int param_index);
+  double               ecl_sum_get_last_value_gen_key(const ecl_sum_type * ecl_sum, const char * gen_key);
+  double               ecl_sum_get_last_value_node(const ecl_sum_type * ecl_sum, const smspec_node_type *node);
+
   UTIL_IS_INSTANCE_HEADER( ecl_sum );
 
 #ifdef __cplusplus
diff --git a/lib/include/ert/ecl/ecl_sum_data.h b/lib/include/ert/ecl/ecl_sum_data.h
index a04d5363f5..c1920083ff 100644
--- a/lib/include/ert/ecl/ecl_sum_data.h
+++ b/lib/include/ert/ecl/ecl_sum_data.h
@@ -86,6 +86,8 @@ typedef struct ecl_sum_data_struct ecl_sum_data_type ;
   bool                     ecl_sum_data_report_step_equal( const ecl_sum_data_type * data1 , const ecl_sum_data_type * data2);
   bool                     ecl_sum_data_report_step_compatible( const ecl_sum_data_type * data1 , const ecl_sum_data_type * data2);
   void                     ecl_sum_data_fwrite_interp_csv_line(const ecl_sum_data_type * data , time_t sim_time, const ecl_sum_vector_type * keylist, FILE *fp);
+  double                   ecl_sum_data_get_last_value(const ecl_sum_data_type * data, int param_index);
+
 
   double_vector_type * ecl_sum_data_alloc_seconds_solution( const ecl_sum_data_type * data , const smspec_node_type * node , double value, bool rates_clamp_lower);
 
diff --git a/python/ecl/summary/ecl_sum.py b/python/ecl/summary/ecl_sum.py
index 1b7c79568a..5822ba2517 100644
--- a/python/ecl/summary/ecl_sum.py
+++ b/python/ecl/summary/ecl_sum.py
@@ -142,7 +142,7 @@ class EclSum(BaseCClass):
     _add_tstep                     = EclPrototype("ecl_sum_tstep_ref ecl_sum_add_tstep(ecl_sum, int, double)")
     _export_csv                    = EclPrototype("void ecl_sum_export_csv(ecl_sum, char*, stringlist, char*, char*)")
     _identify_var_type             = EclPrototype("ecl_sum_var_type ecl_sum_identify_var_type(char*)", bind = False)
-
+    _get_last_value                = EclPrototype("double ecl_sum_get_last_value_gen_key(ecl_sum, char*)")
 
 
     def __init__(self, load_case, join_string=":", include_restart=True):
@@ -452,7 +452,10 @@ def get_last_value(self, key):
         The alternative method 'last' will return a EclSumNode
         instance with some extra time related information.
         """
-        return self[key].last_value
+        if not key in self:
+            raise KeyError("No such key:%s" % key)
+
+        return self._get_last_value(key)
 
     def get_last(self, key):
         """
diff --git a/python/tests/ecl_tests/test_sum.py b/python/tests/ecl_tests/test_sum.py
index 811e7ec6db..bab08754bb 100644
--- a/python/tests/ecl_tests/test_sum.py
+++ b/python/tests/ecl_tests/test_sum.py
@@ -366,6 +366,15 @@ def test_vector_select_all(self):
             self.assertIn(key, ecl_sum_vector)
 
 
+    def test_last(self):
+        case = create_case()
+        with self.assertRaises(KeyError):
+            case.get_last_value("NO_SUCH_KEY")
+        last_fopt = case.get_last_value("FOPT")
+        values = case.get_values("FOPT")
+        self.assertEqual( last_fopt, values[-1])
+
+
     def test_time_range(self):
         case = create_case()
         with self.assertRaises(ValueError):