diff --git a/src/solver/MathsatSmtSolver.cpp b/src/solver/MathsatSmtSolver.cpp
index 2d543884d..e46ab0ceb 100644
--- a/src/solver/MathsatSmtSolver.cpp
+++ b/src/solver/MathsatSmtSolver.cpp
@@ -46,7 +46,7 @@ namespace storm {
         }
         
         int_fast64_t MathsatSmtSolver::MathsatModelReference::getIntegerValue(storm::expressions::Variable const& variable) const {
-            STORM_LOG_ASSERT(variable.hasBooleanType(), "Variable is non-boolean type.");
+            STORM_LOG_ASSERT(variable.hasIntegerType(), "Variable is non-boolean type.");
             msat_term msatVariable = expressionAdapter.translateExpression(variable);
             msat_term msatValue = msat_get_model_value(env, msatVariable);
             STORM_LOG_ASSERT(!MSAT_ERROR_TERM(msatValue), "Unable to retrieve value of variable in model. This could be caused by calls to the solver between checking for satisfiability and model retrieval.");
@@ -55,7 +55,7 @@ namespace storm {
         }
         
         double MathsatSmtSolver::MathsatModelReference::getRationalValue(storm::expressions::Variable const& variable) const {
-            STORM_LOG_ASSERT(variable.hasBooleanType(), "Variable is non-boolean type.");
+            STORM_LOG_ASSERT(variable.hasRationalType(), "Variable is non-boolean type.");
             msat_term msatVariable = expressionAdapter.translateExpression(variable);
             msat_term msatValue = msat_get_model_value(env, msatVariable);
             STORM_LOG_ASSERT(!MSAT_ERROR_TERM(msatValue), "Unable to retrieve value of variable in model. This could be caused by calls to the solver between checking for satisfiability and model retrieval.");
@@ -254,7 +254,7 @@ namespace storm {
 
                 if (stormVariable.hasBooleanType()) {
                     stormModel.setBooleanValue(stormVariable, variableInterpretation.isTrue());
-                } else if (stormVariable.hasIntegralType()) {
+                } else if (stormVariable.hasIntegerType()) {
                     stormModel.setIntegerValue(stormVariable, variableInterpretation.evaluateAsInt());
                 } else if (stormVariable.hasRationalType()) {
                     stormModel.setRationalValue(stormVariable, variableInterpretation.evaluateAsDouble());
diff --git a/src/storage/expressions/Expression.cpp b/src/storage/expressions/Expression.cpp
index fc8b1ebc6..b11a80457 100644
--- a/src/storage/expressions/Expression.cpp
+++ b/src/storage/expressions/Expression.cpp
@@ -151,7 +151,7 @@ namespace storm {
         }
         
         std::ostream& operator<<(std::ostream& stream, Expression const& expression) {
-            stream << expression.getBaseExpression() << "[" << &expression.getManager() << "]";
+            stream << expression.getBaseExpression();
             return stream;
         }
         
diff --git a/src/storage/expressions/Type.cpp b/src/storage/expressions/Type.cpp
index 459550cfa..d3516b662 100644
--- a/src/storage/expressions/Type.cpp
+++ b/src/storage/expressions/Type.cpp
@@ -182,10 +182,7 @@ namespace storm {
         
         Type Type::numericalComparison(Type const& other) const {
             STORM_LOG_ASSERT(this->isNumericalType() && other.isNumericalType(), "Operator requires numerical operands.");
-            if (this->isRationalType() || other.isRationalType()) {
-                return this->getManager().getRationalType();
-            }
-            return this->getManager().getIntegerType();
+            return this->getManager().getBooleanType();
         }
         
         Type Type::ite(Type const& thenType, Type const& elseType) const {
diff --git a/src/storage/expressions/Variable.cpp b/src/storage/expressions/Variable.cpp
index 1608c8b56..8b998107d 100644
--- a/src/storage/expressions/Variable.cpp
+++ b/src/storage/expressions/Variable.cpp
@@ -43,7 +43,7 @@ namespace storm {
             return this->getType().isBooleanType();
         }
         
-        bool Variable::hasIntegralType() const {
+        bool Variable::hasIntegerType() const {
             return this->getType().isIntegralType();
         }
 
diff --git a/src/storage/expressions/Variable.h b/src/storage/expressions/Variable.h
index fd9796658..a55a40c28 100644
--- a/src/storage/expressions/Variable.h
+++ b/src/storage/expressions/Variable.h
@@ -103,7 +103,7 @@ namespace storm {
              *
              * @return True iff the variable if of integral type.
              */
-            bool hasIntegralType() const;
+            bool hasIntegerType() const;
 
             /*!
              * Checks whether the variable is of rational type.
diff --git a/test/functional/adapter/MathsatExpressionAdapterTest.cpp b/test/functional/adapter/MathsatExpressionAdapterTest.cpp
index 154bf0716..78b62a48e 100644
--- a/test/functional/adapter/MathsatExpressionAdapterTest.cpp
+++ b/test/functional/adapter/MathsatExpressionAdapterTest.cpp
@@ -129,7 +129,7 @@ TEST(MathsatExpressionAdapter, StormToMathsatFloorCeil) {
     storm::adapters::MathsatExpressionAdapter adapter(*manager, env);
     
     storm::expressions::Variable d = manager->declareRationalVariable("d");
-    storm::expressions::Variable i = manager->declareIntegerVariable("d");
+    storm::expressions::Variable i = manager->declareIntegerVariable("i");
     
 	storm::expressions::Expression exprFloor = storm::expressions::floor(d) == i && d > manager->rational(4.1) && d < manager->rational(4.991);
     msat_decl iDecl = msat_declare_function(env, "i", msat_get_integer_type(env));
diff --git a/test/functional/adapter/Z3ExpressionAdapterTest.cpp b/test/functional/adapter/Z3ExpressionAdapterTest.cpp
index ba3cc656f..e2beb816b 100644
--- a/test/functional/adapter/Z3ExpressionAdapterTest.cpp
+++ b/test/functional/adapter/Z3ExpressionAdapterTest.cpp
@@ -111,7 +111,7 @@ TEST(Z3ExpressionAdapter, StormToZ3FloorCeil) {
 	storm::adapters::Z3ExpressionAdapter adapter(*manager, ctx);
 
     storm::expressions::Variable d = manager->declareRationalVariable("d");
-    storm::expressions::Variable i = manager->declareIntegerVariable("d");
+    storm::expressions::Variable i = manager->declareIntegerVariable("i");
     
 	storm::expressions::Expression exprFloor = storm::expressions::floor(d) == i && d > manager->rational(4.1) && d < manager->rational(4.991);
 	z3::expr z3Floor = ctx.int_val(4) == ctx.int_const("i");
diff --git a/test/functional/solver/MathSatSmtSolverTest.cpp b/test/functional/solver/MathSatSmtSolverTest.cpp
index 52cb38ee2..bf25ece5d 100644
--- a/test/functional/solver/MathSatSmtSolverTest.cpp
+++ b/test/functional/solver/MathSatSmtSolverTest.cpp
@@ -24,7 +24,7 @@ TEST(MathsatSmtSolver, CheckSat) {
     storm::expressions::Variable b = manager->declareIntegerVariable("b");
     storm::expressions::Variable c = manager->declareIntegerVariable("c");
     
-	storm::expressions::Expression exprFormula = a >= manager->integer(0) && a < manager->integer(5) && b > manager->integer(7) && c == (a * b) && b + a > c;
+	storm::expressions::Expression exprFormula = a >= manager->integer(0) && a < manager->integer(5) && b > manager->integer(7) && c == (a + b - manager->integer(1)) && b + a > c;
     
 	ASSERT_NO_THROW(s.add(exprFormula));
 	ASSERT_NO_THROW(result = s.check());
@@ -240,7 +240,7 @@ TEST(MathsatSmtSolver, InterpolationTest) {
     
     storm::solver::MathsatSmtSolver s2(*manager);
     
-    ASSERT_NO_THROW(s2.add(storm::expressions::implies(!(exprFormula && exprFormula2), interpol)));
+    ASSERT_NO_THROW(s2.add(!storm::expressions::implies(exprFormula && exprFormula2, interpol)));
     ASSERT_NO_THROW(result = s2.check());
     ASSERT_TRUE(result == storm::solver::SmtSolver::CheckResult::Unsat);