diff --git a/cups-gz-crc.patch b/cups-gz-crc.patch
new file mode 100644
index 0000000..699e5e4
--- /dev/null
+++ b/cups-gz-crc.patch
@@ -0,0 +1,14 @@
+diff -up cups-1.6.2/cups/file.c.gz-crc cups-1.6.2/cups/file.c
+--- cups-1.6.2/cups/file.c.gz-crc	2013-07-11 12:06:49.920878639 +0100
++++ cups-1.6.2/cups/file.c	2013-07-11 12:13:41.169628104 +0100
+@@ -2429,8 +2429,8 @@ cups_fill(cups_file_t *fp)		/* I - CUPS
+ 	}
+ 	else
+ 	{
+-	  tcrc = (((((trailer[3] << 8) | trailer[2]) << 8) | trailer[1]) << 8) |
+-        	 trailer[0];
++	  tcrc = (((uLong) ((trailer[3] << 8) | trailer[2])) << 16) |
++		   (uLong) ((trailer[1] << 8) | trailer[0]);
+ 
+ 	  if (tcrc != fp->crc)
+ 	  {
diff --git a/cups.spec b/cups.spec
index dbe5898..8987b5c 100644
--- a/cups.spec
+++ b/cups.spec
@@ -11,7 +11,7 @@ Summary: CUPS printing system
 Name: cups
 Epoch: 1
 Version: 1.6.2
-Release: 17%{?dist}
+Release: 18%{?dist}
 License: GPLv2
 Group: System Environment/Daemons
 Url: http://www.cups.org/
@@ -62,6 +62,7 @@ Patch31: cups-dymo-deviceid.patch
 Patch32: cups-use-ipp1.1.patch
 Patch33: cups-no-gcry.patch
 Patch34: cups-avahi-no-threaded.patch
+Patch35: cups-gz-crc.patch
 
 Patch100: cups-lspp.patch
 
@@ -247,6 +248,8 @@ Sends IPP requests to the specified URI and tests and/or displays the results.
 %patch33 -p1 -b .no-gcry
 # Don't use D-Bus from two threads (bug #979748).
 %patch34 -p1 -b .avahi-no-threaded
+# Avoid sign-extending CRCs for gz decompression (bug #983486).
+%patch35 -p1 -b .gz-crc
 
 %if %lspp
 # LSPP support.
@@ -640,6 +643,9 @@ rm -f %{cups_serverbin}/backend/smb
 %{_mandir}/man5/ipptoolfile.5.gz
 
 %changelog
+* Thu Jul 11 2013 Tim Waugh <twaugh@redhat.com> 1:1.6.2-18
+- Avoid sign-extending CRCs for gz decompression (bug #983486).
+
 * Wed Jul 10 2013 Tim Waugh <twaugh@redhat.com> 1:1.6.2-17
 - Fixed download URL.