diff --git a/src/input/ReaderBackend.cc b/src/input/ReaderBackend.cc
index 0a6ff37dc2..ce79ecfd39 100644
--- a/src/input/ReaderBackend.cc
+++ b/src/input/ReaderBackend.cc
@@ -169,6 +169,9 @@ bool ReaderBackend::Init(string arg_source, int mode, const int arg_num_fields,
 	source = arg_source;
 	SetName("InputReader/"+source);
 
+	num_fields = arg_num_fields;
+	fields = arg_fields;	
+
 	// disable if DoInit returns error.
 	int success = DoInit(arg_source, mode, arg_num_fields, arg_fields);
 
@@ -188,6 +191,16 @@ void ReaderBackend::Finish()
 	disabled = true;
 	DisableFrontend();
 	SendOut(new ReaderFinishedMessage(frontend));
+
+	if ( fields != 0 ) {
+
+		for ( unsigned int i = 0; i < num_fields; i++ ) {
+			delete(fields[i]);
+		}
+
+		delete[] (fields);
+		fields = 0;
+	}
 }
 
 bool ReaderBackend::Update() 
diff --git a/src/input/ReaderBackend.h b/src/input/ReaderBackend.h
index 28fd99f2b9..5742f72368 100644
--- a/src/input/ReaderBackend.h
+++ b/src/input/ReaderBackend.h
@@ -228,6 +228,9 @@ private:
 	char* buf;
 	unsigned int buf_len;
 	bool autostart;
+
+	unsigned int num_fields;
+	const threading::Field* const * fields; // raw mapping		
 };
 
 }
diff --git a/src/input/readers/Ascii.cc b/src/input/readers/Ascii.cc
index 20ae79ab19..553a4ada81 100644
--- a/src/input/readers/Ascii.cc
+++ b/src/input/readers/Ascii.cc
@@ -73,7 +73,6 @@ Ascii::Ascii(ReaderFrontend *frontend) : ReaderBackend(frontend)
 Ascii::~Ascii()
 {
 	DoFinish();
-
 }
 
 void Ascii::DoFinish()