diff -r 193c643f4ffe -r 3b81fbeb5f3b src/lib/UnescapingProcessor.h
--- a/src/lib/UnescapingProcessor.h	Sun Nov 29 10:50:16 2020 +0100
+++ b/src/lib/UnescapingProcessor.h	Sun Dec 13 17:34:26 2020 +0100
@@ -20,8 +20,6 @@
 
 #include "INIReader.h"
 
-using namespace std;
-
 namespace relpipe {
 namespace in {
 namespace ini {
@@ -52,6 +50,8 @@
 
 	virtual std::string unescape(const std::string& s, const TextType type) = 0;
 
+	virtual ~UnescapingProcessor() {
+	}
 };
 
 }