diff --git a/src/TNL/Images/RegionOfInterest_impl.h b/src/TNL/Images/RegionOfInterest_impl.h
index e8469670b7e6e060a40be70c540a763f021322b5..2ab54f6ef8234de90a204fac65cd8a84c7107efc 100644
--- a/src/TNL/Images/RegionOfInterest_impl.h
+++ b/src/TNL/Images/RegionOfInterest_impl.h
@@ -167,7 +167,7 @@ setGrid( Grid& grid,
     origin.x() = 0.0;
     origin.y() = 0.0;
     proportions.x() = 1.0;
-    proportions.y() = ( double ) grid.getDimensions().x() / ( double ) grid.getDimensions().y();
+    proportions.y() = ( double ) grid.getDimensions().y() / ( double ) grid.getDimensions().x();
     grid.setDomain( origin, proportions );
     if( verbose )
     {