Index: trunk/src/org/openstreetmap/josm/data/imagery/OffsetBookmark.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/imagery/OffsetBookmark.java	(revision 3965)
+++ trunk/src/org/openstreetmap/josm/data/imagery/OffsetBookmark.java	(revision 3966)
@@ -69,5 +69,5 @@
         }
         // Mercator scale factor migration
-        if (proj instanceof Mercator && this.dx < 1E-3 && this.dy < 1E-3) {
+        if (proj instanceof Mercator && Math.abs(this.dx) < 1E-3 && Math.abs(this.dy) < 1E-3) {
             this.dx *= 6378137;
             this.dy *= 6378137;