diff --git a/0001-Use-memmove-instead-of-memcpy-in-fbblt.c-when-memory.patch b/0001-Use-memmove-instead-of-memcpy-in-fbblt.c-when-memory.patch
new file mode 100644
index 0000000..50d6c53
--- /dev/null
+++ b/0001-Use-memmove-instead-of-memcpy-in-fbblt.c-when-memory.patch
@@ -0,0 +1,54 @@
+From b08e7198dc0141b8074d8fdff681019d86655a38 Mon Sep 17 00:00:00 2001
+From: Adam Tkac <atkac@redhat.com>
+Date: Tue, 12 Apr 2011 16:49:43 +0200
+Subject: [PATCH] Use memmove instead of memcpy in fbblt.c when memory regions
+ overlap.
+
+Signed-off-by: Adam Tkac <atkac@redhat.com>
+---
+ fb/fb.h    |    4 ++++
+ fb/fbblt.c |    4 ++--
+ 2 files changed, 6 insertions(+), 2 deletions(-)
+
+diff --git a/fb/fb.h b/fb/fb.h
+index eaa21ad..f68fe3b 100644
+--- a/fb/fb.h
++++ b/fb/fb.h
+@@ -66,6 +66,9 @@
+     }                                                             \
+ } while(0)
+ 
++/* XXX: Is this enough? */
++#define MEMMOVE_WRAPPED MEMCPY_WRAPPED
++
+ #else
+ 
+ #define FBPREFIX(x) fb##x
+@@ -73,6 +76,7 @@
+ #define READ(ptr) (*(ptr))
+ #define MEMCPY_WRAPPED(dst, src, size) memcpy((dst), (src), (size))
+ #define MEMSET_WRAPPED(dst, val, size) memset((dst), (val), (size))
++#define MEMMOVE_WRAPPED(dst, src, size) memmove((dst), (src), (size))
+ 
+ #endif
+ 
+diff --git a/fb/fbblt.c b/fb/fbblt.c
+index a040298..e16c660 100644
+--- a/fb/fbblt.c
++++ b/fb/fbblt.c
+@@ -88,10 +88,10 @@ fbBlt (FbBits   *srcLine,
+ 
+         if (!upsidedown)
+             for (i = 0; i < height; i++)
+-                MEMCPY_WRAPPED(dst + i * dstStride, src + i * srcStride, width);
++                MEMMOVE_WRAPPED(dst + i * dstStride, src + i * srcStride, width);
+         else
+             for (i = height - 1; i >= 0; i--)
+-                MEMCPY_WRAPPED(dst + i * dstStride, src + i * srcStride, width);
++                MEMMOVE_WRAPPED(dst + i * dstStride, src + i * srcStride, width);
+ 
+         return;
+     }
+-- 
+1.7.4.4
+
diff --git a/tigervnc.spec b/tigervnc.spec
index 512ddf2..62c814f 100644
--- a/tigervnc.spec
+++ b/tigervnc.spec
@@ -1,6 +1,6 @@
 Name:		tigervnc
 Version:	1.0.90
-Release:	2%{?dist}
+Release:	3%{?dist}
 Summary:	A TigerVNC remote display system
 
 Group:		User Interface/Desktops
@@ -45,6 +45,7 @@ Patch10:	tigervnc11-ldnow.patch
 Patch11:	tigervnc11-gethomedir.patch
 Patch12:	tigervnc11-glx.patch
 Patch13:	tigervnc11-rh692048.patch
+Patch14:	0001-Use-memmove-instead-of-memcpy-in-fbblt.c-when-memory.patch
 
 %description
 Virtual Network Computing (VNC) is a remote display system which
@@ -140,6 +141,7 @@ for all in `find . -type f -perm -001`; do
 	chmod -x "$all"
 done
 patch -p1 -b --suffix .vnc < %{SOURCE7}
+%patch14 -p1 -b .memcpy
 popd
 
 # Use newer gettext
@@ -302,6 +304,9 @@ fi
 %doc LICENCE.TXT
 
 %changelog
+* Wed Apr 13 2011 Adam Tkac <atkac redhat com> - 1.0.90-3
+- fix wrong usage of memcpy which caused screen artifacts (#652590)
+
 * Fri Apr 08 2011 Adam Tkac <atkac redhat com> - 1.0.90-2
 - improve compatibility with vinagre client (#692048)