diff --git a/headers/os/interface/Point.h b/headers/os/interface/Point.h
index 2bd4fab359..609f999d03 100644
--- a/headers/os/interface/Point.h
+++ b/headers/os/interface/Point.h
@@ -29,6 +29,7 @@ public:
 	void	ConstrainTo(BRect r);
 	void	PrintToStream() const;
 			
+	BPoint	operator-() const;
 	BPoint	operator+(const BPoint &p) const;
 	BPoint	operator-(const BPoint &p) const;
 	BPoint&	operator+=(const BPoint &p);
diff --git a/src/kits/interface/Point.cpp b/src/kits/interface/Point.cpp
index 520fb19388..d33df38689 100644
--- a/src/kits/interface/Point.cpp
+++ b/src/kits/interface/Point.cpp
@@ -33,6 +33,13 @@ BPoint::PrintToStream() const
 }
 
 
+BPoint
+BPoint::operator-() const
+{
+	return BPoint(-x, -y);
+}
+
+
 BPoint
 BPoint::operator+(const BPoint& p) const
 {