diff --git a/alib2data/src/automaton/PDA/NPDTA.h b/alib2data/src/automaton/PDA/NPDTA.h
index c25e25eca4df80e8212933913fac431ca45fdefb..19eea0d1ce59d98968add5532691b21a08f0f9a9 100644
--- a/alib2data/src/automaton/PDA/NPDTA.h
+++ b/alib2data/src/automaton/PDA/NPDTA.h
@@ -109,16 +109,4 @@ public:
 
 } /* namespace automaton */
 
-namespace std {
-
-template < >
-struct compare < automaton::NPDTA > {
-	int operator ()( const automaton::NPDTA & first, const automaton::NPDTA & second ) const {
-		return first.compare ( second );
-	}
-
-};
-
-} /* namespace std */
-
 #endif /* NPDTA_H_ */