diff --git a/include/plasp/output/Logger.h b/include/plasp/output/Logger.h
index 8624426..ce65659 100644
--- a/include/plasp/output/Logger.h
+++ b/include/plasp/output/Logger.h
@@ -24,8 +24,6 @@ class Logger
 		explicit Logger();
 		explicit Logger(ColorStream &&outputStream);
 		explicit Logger(ColorStream &&outputStream, ColorStream &&errorStream);
-		Logger(Logger &&other);
-		Logger &operator=(Logger &&other);
 
 		ColorStream &outputStream();
 		ColorStream &errorStream();
diff --git a/include/plasp/pddl/expressions/Quantified.h b/include/plasp/pddl/expressions/Quantified.h
index ded7432..9948b09 100644
--- a/include/plasp/pddl/expressions/Quantified.h
+++ b/include/plasp/pddl/expressions/Quantified.h
@@ -57,7 +57,7 @@ class QuantifiedCRTP: public Quantified
 		ExpressionPointer simplified() override;
 		ExpressionPointer decomposed(DerivedPredicates &derivedPredicates) override;
 
-		void collectParameters(std::set<VariablePointer> &parameters);
+		void collectParameters(std::set<VariablePointer> &parameters) override;
 
 		void print(std::ostream &ostream) const override;
 };
diff --git a/src/plasp/output/Logger.cpp b/src/plasp/output/Logger.cpp
index 3cf57f3..634ff98 100644
--- a/src/plasp/output/Logger.cpp
+++ b/src/plasp/output/Logger.cpp
@@ -64,25 +64,6 @@ Logger::Logger(ColorStream &&outputStream, ColorStream &&errorStream)
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-Logger::Logger(Logger &&other)
-:	m_outputStream{std::move(other.m_outputStream)},
-	m_errorStream{std::move(other.m_errorStream)},
-	m_logPriority{other.m_logPriority},
-	m_abortPriority{other.m_abortPriority}
-{
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-Logger &Logger::operator=(Logger &&other)
-{
-	*this = std::move(other);
-
-	return *this;
-}
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
 ColorStream &Logger::outputStream()
 {
 	return m_outputStream;
diff --git a/src/plasp/pddl/Expression.cpp b/src/plasp/pddl/Expression.cpp
index 6242aaf..82d3703 100644
--- a/src/plasp/pddl/Expression.cpp
+++ b/src/plasp/pddl/Expression.cpp
@@ -63,7 +63,7 @@ ExpressionPointer Expression::simplified()
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-[[ noreturn ]] ExpressionPointer Expression::decomposed(expressions::DerivedPredicates &)
+ExpressionPointer Expression::decomposed(expressions::DerivedPredicates &)
 {
 	throw output::TranslatorException("expression cannot be decomposed (not normalized)");
 }