diff --git a/src/storm/solver/GurobiLpSolver.cpp b/src/storm/solver/GurobiLpSolver.cpp
index caa6b945e..3e0db5333 100644
--- a/src/storm/solver/GurobiLpSolver.cpp
+++ b/src/storm/solver/GurobiLpSolver.cpp
@@ -158,7 +158,7 @@ namespace storm {
         void GurobiLpSolver<ValueType>::addVariable(storm::expressions::Variable const& variable, char variableType, ValueType lowerBound, ValueType upperBound, ValueType objectiveFunctionCoefficient) {
             // Assert whether the variable does not exist yet.
             // Due to incremental usage (push(), pop()), a variable might be declared in the manager but not in the lp model.
-            STORM_LOG_ASSERT(variableToIndexMap.count(variable) == 0, "Variable " << variable << " exists already in the model.");
+            STORM_LOG_ASSERT(variableToIndexMap.count(variable) == 0, "Variable " << variable.getName() << " exists already in the model.");
             // Check for valid variable type.
             STORM_LOG_ASSERT(variableType == GRB_CONTINUOUS || variableType == GRB_INTEGER || variableType == GRB_BINARY, "Illegal type '" << variableType << "' for Gurobi variable.");
             
diff --git a/src/storm/storage/expressions/ExpressionManager.cpp b/src/storm/storage/expressions/ExpressionManager.cpp
index ce10152e4..219e5a521 100644
--- a/src/storm/storage/expressions/ExpressionManager.cpp
+++ b/src/storm/storage/expressions/ExpressionManager.cpp
@@ -167,7 +167,7 @@ namespace storm {
             STORM_LOG_THROW(!checkName || isValidVariableName(name), storm::exceptions::InvalidArgumentException, "Invalid variable name '" << name << "'.");
             auto nameIndexPair = nameToIndexMapping.find(name);
             if (nameIndexPair != nameToIndexMapping.end()) {
-                STORM_LOG_ASSERT(indexToTypeMapping.at(nameIndexPair->second) == variableType, "Tried to declareOrGet variable '" << name << "' of type '" << variableType << "' but there is a variable with that name and different type '" << indexToTypeMapping.at(nameIndexPair->second)"'.");
+                STORM_LOG_ASSERT(indexToTypeMapping.at(nameIndexPair->second) == variableType, "Tried to declareOrGet variable '" << name << "' of type '" << variableType << "' but there is a variable with that name and different type '" << indexToTypeMapping.at(nameIndexPair->second) << "'.");
                 return Variable(this->getSharedPointer(), nameIndexPair->second);
             } else {
                 uint_fast64_t offset = 0;