diff --git a/ChangeLog b/ChangeLog
index 623f2d37c6..e325ffbf39 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2003-03-31  Michael Natterer  <mitch@gimp.org>
+
+	* app/core/gimpdrawable-transform-utils.c
+	(gimp_drawable_transform_matrix_perspective): applied patch from
+	Øyvind Kolås that fixes bug #109570.
+
 2003-03-30  Sven Neumann  <sven@gimp.org>
 
 	* configure.in
diff --git a/app/core/gimp-transform-utils.c b/app/core/gimp-transform-utils.c
index fb61dd00a0..57c81a6d60 100644
--- a/app/core/gimp-transform-utils.c
+++ b/app/core/gimp-transform-utils.c
@@ -161,7 +161,7 @@ gimp_drawable_transform_matrix_perspective (gint        x1,
     dx2 = tx3 - tx4;
     dx3 = tx1 - tx2 + tx4 - tx3;
 
-    dy1 = ty2 - ty3;
+    dy1 = ty2 - ty4;
     dy2 = ty3 - ty4;
     dy3 = ty1 - ty2 + ty4 - ty3;
 
diff --git a/app/core/gimpdrawable-transform-utils.c b/app/core/gimpdrawable-transform-utils.c
index fb61dd00a0..57c81a6d60 100644
--- a/app/core/gimpdrawable-transform-utils.c
+++ b/app/core/gimpdrawable-transform-utils.c
@@ -161,7 +161,7 @@ gimp_drawable_transform_matrix_perspective (gint        x1,
     dx2 = tx3 - tx4;
     dx3 = tx1 - tx2 + tx4 - tx3;
 
-    dy1 = ty2 - ty3;
+    dy1 = ty2 - ty4;
     dy2 = ty3 - ty4;
     dy3 = ty1 - ty2 + ty4 - ty3;