diff --git a/gd-2.0.35-AALineThick.patch b/gd-2.0.35-AALineThick.patch
index 9d4fd66..4349ada 100644
--- a/gd-2.0.35-AALineThick.patch
+++ b/gd-2.0.35-AALineThick.patch
@@ -1,5 +1,6 @@
---- gd-2.0.35/gd.c.pom	2007-06-19 22:25:51.000000000 +0200
-+++ gd-2.0.35/gd.c	2007-09-05 11:25:16.000000000 +0200
+diff -up gd-2.0.35/gd.c.AALineThick gd-2.0.35/gd.c
+--- gd-2.0.35/gd.c.AALineThick	2007-06-19 22:25:51.000000000 +0200
++++ gd-2.0.35/gd.c	2012-02-28 11:02:09.708015922 +0100
 @@ -3474,6 +3474,8 @@ static void gdImageAALine (gdImagePtr im
  	/* keep them as 32bits */
  	long x, y, inc;
@@ -15,13 +16,13 @@
  	}
 +	else { 
 +	    double ag; 
-+	    if (dy < dx)  
++	    if (abs(dy) < abs(dx))  
 +		ag  = cos (atan2 (dy, dx)); 
 +	    else  
 +		ag = sin (atan2 (dy, dx)); 
 +	    if (ag != 0)
 +	    {
-+		wid = thick / ag; 
++		wid = abs(thick / ag); 
 +	    }
 +	    else
 +	    {
diff --git a/gd.spec b/gd.spec
index 94396a3..bce9696 100644
--- a/gd.spec
+++ b/gd.spec
@@ -1,7 +1,7 @@
 Summary:       A graphics library for quick creation of PNG or JPEG images
 Name:          gd
 Version:       2.0.35
-Release:       13%{?dist}
+Release:       14%{?dist}
 Group:         System Environment/Libraries
 License:       MIT
 URL:           http://www.libgd.org/Main_Page
@@ -99,6 +99,10 @@ rm -rf $RPM_BUILD_ROOT
 %{_libdir}/pkgconfig/gdlib.pc
 
 %changelog
+* Tue Feb 28 2012 Honza Horak <hhorak@redhat.com> - 2.0.35-14
+- Fixed AALineThick.patch to display vertical lines correctly
+  Resolves: #798255
+
 * Wed Oct 26 2011 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 2.0.35-13
 - Rebuilt for glibc bug#747377