diff --git a/opm/parser/eclipse/EclipseState/Aquifer/Aquancon.hpp b/opm/parser/eclipse/EclipseState/Aquifer/Aquancon.hpp
index fbf44df16..628cf66e6 100644
--- a/opm/parser/eclipse/EclipseState/Aquifer/Aquancon.hpp
+++ b/opm/parser/eclipse/EclipseState/Aquifer/Aquancon.hpp
@@ -85,7 +85,7 @@ namespace Opm {
 
             Aquancon() = default;
             Aquancon(const EclipseGrid& grid, const Deck& deck);
-            Aquancon(const std::unordered_map<int, std::vector<Aquancon::AquancCell>>& data);
+            explicit Aquancon(const std::unordered_map<int, std::vector<Aquancon::AquancCell>>& data);
 
             static Aquancon serializeObject();
 
diff --git a/opm/parser/eclipse/EclipseState/Aquifer/Aquifetp.hpp b/opm/parser/eclipse/EclipseState/Aquifer/Aquifetp.hpp
index a3b93845e..5e165e8f5 100644
--- a/opm/parser/eclipse/EclipseState/Aquifer/Aquifetp.hpp
+++ b/opm/parser/eclipse/EclipseState/Aquifer/Aquifetp.hpp
@@ -96,7 +96,7 @@ class Aquifetp {
 
     Aquifetp() = default;
     Aquifetp(const TableManager& tables, const Deck& deck);
-    Aquifetp(const std::vector<Aquifetp::AQUFETP_data>& data);
+    explicit Aquifetp(const std::vector<Aquifetp::AQUFETP_data>& data);
 
     static Aquifetp serializeObject();
 
diff --git a/tests/test_AggregateAquiferData.cpp b/tests/test_AggregateAquiferData.cpp
index 1aafcf13a..232e3d990 100644
--- a/tests/test_AggregateAquiferData.cpp
+++ b/tests/test_AggregateAquiferData.cpp
@@ -269,7 +269,7 @@ AQUTAB
             ct.finishInitialisation(waterProperties());
         }
 
-        return { properties };
+        return Opm::AquiferCT(properties);
     }
 
     void connectFetkovic(AquiferConnections& aquancon)
@@ -329,7 +329,7 @@ AQUTAB
             fetp.finishInitialisation(waterProperties());
         }
 
-        return { properties };
+        return Opm::Aquifetp(properties);
     }
 
     Opm::AquiferConfig createAquiferConfig()
@@ -339,7 +339,7 @@ AQUTAB
         connectFetkovic(aquancon);
 
         return {
-            createFetkovich(), createCarterTracy(), aquancon.getAllConnections()
+            createFetkovich(), createCarterTracy(), Opm::Aquancon(aquancon.getAllConnections())
         };
     }