diff --git a/src/libcalamares/Settings.cpp b/src/libcalamares/Settings.cpp
index a05474216..3252e706f 100644
--- a/src/libcalamares/Settings.cpp
+++ b/src/libcalamares/Settings.cpp
@@ -210,7 +210,13 @@ interpretSequence( const YAML::Node& node, Settings::ModuleSequence& moduleSeque
             }
 
             QStringList thisActionRoster = sequenceVListItem.toMap().value( thisActionS ).toStringList();
-            moduleSequence.append( qMakePair( thisAction, thisActionRoster ) );
+            Calamares::ModuleSystem::InstanceKeyList roster;
+            roster.reserve( thisActionRoster.count() );
+            std::transform( thisActionRoster.constBegin(),
+                            thisActionRoster.constEnd(),
+                            std::back_inserter( roster ),
+                            []( const QString& s ) { return Calamares::ModuleSystem::InstanceKey::fromString( s ); } );
+            moduleSequence.append( qMakePair( thisAction, roster ) );
         }
     }
     else
@@ -262,24 +268,23 @@ Settings::validateSequence()
     // Check the sequence against the existing instances (which so far are only custom)
     for ( const auto& step : m_modulesSequence )
     {
-        for ( const auto& instance : step.second )
+        for ( const auto& instanceKey : step.second )
         {
-            Calamares::ModuleSystem::InstanceKey k = Calamares::ModuleSystem::InstanceKey::fromString( instance );
-            if ( !k.isValid() )
+            if ( !instanceKey.isValid() )
             {
-                cWarning() << "Invalid instance key in *sequence*," << instance;
+                cWarning() << "Invalid instance key in *sequence*," << instanceKey;
                 continue;
             }
 
-            targetKey = k;
+            targetKey = instanceKey;
             const auto it = std::find_if( m_moduleInstances.constBegin(), m_moduleInstances.constEnd(), moduleFinder );
             if ( it == m_moduleInstances.constEnd() )
             {
-                if ( k.isCustom() )
+                if ( instanceKey.isCustom() )
                 {
-                    cWarning() << "Custom instance key" << instance << "is not listed in the *instances*";
+                    cWarning() << "Custom instance key" << instanceKey << "is not listed in the *instances*";
                 }
-                m_moduleInstances.append( InstanceDescription( k ) );
+                m_moduleInstances.append( InstanceDescription( instanceKey ) );
             }
         }
     }
diff --git a/src/libcalamares/Settings.h b/src/libcalamares/Settings.h
index d06a97716..6ebccfb43 100644
--- a/src/libcalamares/Settings.h
+++ b/src/libcalamares/Settings.h
@@ -110,7 +110,7 @@ public:
      */
     InstanceDescriptionList moduleInstances() const;
 
-    using ModuleSequence = QList< QPair< ModuleSystem::Action, QStringList > >;
+    using ModuleSequence = QList< QPair< ModuleSystem::Action, Calamares::ModuleSystem::InstanceKeyList > >;
     /** @brief Representation of *sequence* of execution
      *
      * Each "section" of the *sequence* key in `settings.conf` gets an
diff --git a/src/libcalamares/modulesystem/InstanceKey.h b/src/libcalamares/modulesystem/InstanceKey.h
index 0bfa636f1..074743bf3 100644
--- a/src/libcalamares/modulesystem/InstanceKey.h
+++ b/src/libcalamares/modulesystem/InstanceKey.h
@@ -22,6 +22,7 @@
 #define MODULESYSTEM_INSTANCEKEY_H
 
 #include <QDebug>
+#include <QList>
 #include <QPair>
 #include <QString>
 
@@ -96,6 +97,8 @@ private:
     }
 };
 
+using InstanceKeyList = QList< InstanceKey >;
+
 QDebug& operator<<( QDebug& s, const Calamares::ModuleSystem::InstanceKey& i );
 
 }  // namespace ModuleSystem