diff --git a/src/storm-pars/analysis/AssumptionMaker.cpp b/src/storm-pars/analysis/AssumptionMaker.cpp
index 0fadf2bfc..134e52097 100644
--- a/src/storm-pars/analysis/AssumptionMaker.cpp
+++ b/src/storm-pars/analysis/AssumptionMaker.cpp
@@ -13,15 +13,12 @@ namespace storm {
             this->expressionManager = std::make_shared<storm::expressions::ExpressionManager>(storm::expressions::ExpressionManager());
             for (uint_fast64_t i = 0; i < this->numberOfStates; ++i) {
                 expressionManager->declareIntegerVariable(std::to_string(i));
-                expressionManager->declareFreshIntegerVariable();
             }
         }
 
-
         template<typename ValueType>
         std::map<storm::analysis::Lattice*, std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>>>
                 AssumptionMaker<ValueType>::startMakingAssumptions(storm::analysis::Lattice* lattice, uint_fast64_t critical1, uint_fast64_t critical2) {
-
             std::map<storm::analysis::Lattice*, std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>>> result;
 
             std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>> emptySet;
@@ -32,7 +29,9 @@ namespace storm {
                 storm::expressions::Variable var2 = expressionManager->getVariable(std::to_string(critical2));
                 std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>> assumptions;
 
-                auto myMap = createAssumptions(var1, var2, lattice, assumptions);
+                auto latticeCopy = new Lattice(lattice);
+                std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>> assumptionsCopy = std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>>(assumptions);
+                auto myMap = createAssumptions(var1, var2, latticeCopy, assumptionsCopy);
                 result.insert(myMap.begin(), myMap.end());
 
                 myMap = createAssumptions(var2, var1, lattice, assumptions);
@@ -52,7 +51,9 @@ namespace storm {
                 storm::expressions::Variable var1 = expressionManager->getVariable(std::to_string(std::get<1>(criticalPair)));
                 storm::expressions::Variable var2 = expressionManager->getVariable(std::to_string(std::get<2>(criticalPair)));
 
-                auto myMap = createAssumptions(var1, var2, lattice, assumptions);
+                auto latticeCopy = new Lattice(lattice);
+                std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>> assumptionsCopy = std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>>(assumptions);
+                auto myMap = createAssumptions(var1, var2, latticeCopy, assumptionsCopy);
                 result.insert(myMap.begin(), myMap.end());
                 myMap = createAssumptions(var2, var1, lattice, assumptions);
                 result.insert(myMap.begin(), myMap.end());
@@ -63,19 +64,14 @@ namespace storm {
 
         template <typename ValueType>
         std::map<storm::analysis::Lattice*, std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>>> AssumptionMaker<ValueType>::createAssumptions(storm::expressions::Variable var1, storm::expressions::Variable var2, storm::analysis::Lattice* lattice, std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>> assumptions) {
-            std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>> assumptions1 = std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>>(assumptions);
             std::shared_ptr<storm::expressions::BinaryRelationExpression> assumption1
                 = std::make_shared<storm::expressions::BinaryRelationExpression>(storm::expressions::BinaryRelationExpression(*expressionManager, var1.getType(),
                         var1.getExpression().getBaseExpressionPointer(), var2.getExpression().getBaseExpressionPointer(),
                         storm::expressions::BinaryRelationExpression::RelationType::Greater));
-            assumptions1.insert(assumption1);
-            auto lattice1 = new Lattice(lattice);
-            return (runRecursive(lattice1, assumptions1));
+            assumptions.insert(assumption1);
+            return (runRecursive(lattice, assumptions));
         }
 
         template class AssumptionMaker<storm::RationalFunction>;
     }
 }
-
-
-// Een map met daarin een pointer naar de lattic en een set met de geldende assumptions voor die lattice
\ No newline at end of file
diff --git a/src/storm-pars/analysis/AssumptionMaker.h b/src/storm-pars/analysis/AssumptionMaker.h
index 7061a43fb..2fa0a890c 100644
--- a/src/storm-pars/analysis/AssumptionMaker.h
+++ b/src/storm-pars/analysis/AssumptionMaker.h
@@ -19,7 +19,6 @@ namespace storm {
 
             std::map<storm::analysis::Lattice*, std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>>> startMakingAssumptions(storm::analysis::Lattice* lattice, uint_fast64_t critical1, uint_fast64_t critical2);
 
-
         private:
             std::map<storm::analysis::Lattice*, std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>>> runRecursive(storm::analysis::Lattice* lattice, std::set<std::shared_ptr<storm::expressions::BinaryRelationExpression>> assumptions);
 
diff --git a/src/storm-pars/analysis/Lattice.cpp b/src/storm-pars/analysis/Lattice.cpp
index 1846b816e..a7e5acfe5 100644
--- a/src/storm-pars/analysis/Lattice.cpp
+++ b/src/storm-pars/analysis/Lattice.cpp
@@ -139,7 +139,6 @@ namespace storm {
             return UNKNOWN;
         }
 
-
         Lattice::Node *Lattice::getNode(uint_fast64_t stateNumber) {
             return nodes.at(stateNumber);
         }