diff --git a/libsolidity/Types.cpp b/libsolidity/Types.cpp
index 65acba844..bedd2e7b0 100644
--- a/libsolidity/Types.cpp
+++ b/libsolidity/Types.cpp
@@ -693,6 +693,8 @@ string ReferenceType::stringForReferencePart() const
 	case Location::Memory:
 		return "memory";
 	}
+	solAssert(false, "");
+	return "";
 }
 
 bool ArrayType::isImplicitlyConvertibleTo(const Type& _convertTo) const