diff --git a/pkgs/applications/misc/mupdf/default.nix b/pkgs/applications/misc/mupdf/default.nix
index 9b39f1c3c388..c988d1713270 100644
--- a/pkgs/applications/misc/mupdf/default.nix
+++ b/pkgs/applications/misc/mupdf/default.nix
@@ -2,12 +2,12 @@
 , libX11, libXext }:
 
 stdenv.mkDerivation rec {
-  version = "1.7";
+  version = "1.7a";
   name = "mupdf-${version}";
 
   src = fetchurl {
     url = "http://mupdf.com/download/archive/${name}-source.tar.gz";
-    sha256 = "0hjn1ywxhblqgj63qkp8x7qqjnwsgid3viw8az5i2i26dijmrgfh";
+    sha256 = "073xq6kczq331awycvznpc49b22idqzdlw4g9254zi0z07x5y0wc";
   };
 
   buildInputs = [ pkgconfig zlib freetype libjpeg jbig2dec openjpeg libX11 libXext ];