diff --git a/opm/input/eclipse/Schedule/Group/GPMaint.cpp b/opm/input/eclipse/Schedule/Group/GPMaint.cpp
index 553706b58c3..1286f5ce739 100644
--- a/opm/input/eclipse/Schedule/Group/GPMaint.cpp
+++ b/opm/input/eclipse/Schedule/Group/GPMaint.cpp
@@ -79,9 +79,6 @@ GPMaint GPMaint::serializationTestObject() {
 }
 
 std::optional<std::pair<std::string, int>> GPMaint::region() const {
-    if (this->m_region_number == 0)
-        return {};
-
     return std::make_pair(this->m_region_name, this->m_region_number);
 }
 
diff --git a/tests/parser/GroupTests.cpp b/tests/parser/GroupTests.cpp
index bc40c6bf6af..309a3212819 100644
--- a/tests/parser/GroupTests.cpp
+++ b/tests/parser/GroupTests.cpp
@@ -820,13 +820,17 @@ GCONPROD
         BOOST_CHECK( !prod_group.has_control(Phase::GAS, Group::InjectionCMode::RESV) );
         BOOST_CHECK( f1_group.has_control(Group::ProductionCMode::RESV) );
 
+        {
         auto [name, number] = *gpm_prod->region();
         BOOST_CHECK_EQUAL(number, 2);
         BOOST_CHECK_EQUAL(name, "FIPNUM");
-
+        }
+        {
         const auto& gpm_c1 = c1_group.gpmaint();
-        BOOST_CHECK(!gpm_c1->region());
-
+        auto [name, number] = *gpm_c1->region();
+        BOOST_CHECK_EQUAL(number, 0);
+        BOOST_CHECK_EQUAL(name, "FIPNUM");
+        }
         const auto& plat_prod = plat_group.gpmaint();
         BOOST_CHECK( !plat_prod );
     }