diff --git a/pkgs/development/libraries/webkit/default.nix b/pkgs/development/libraries/webkit/default.nix
index 1d99f8ea2f77..fc0168864f24 100644
--- a/pkgs/development/libraries/webkit/default.nix
+++ b/pkgs/development/libraries/webkit/default.nix
@@ -26,9 +26,7 @@ rec {
     "--enable-web-sockets"
     "--enable-indexeddb"
     "--enable-image-resizer"
-    
-    # https://bugs.webkit.org/show_bug.cgi?id=40773
-    # "--enable-mathml"
+    "--enable-mathml"
 
     # "--enable-blob-slice"
     
@@ -43,7 +41,7 @@ rec {
     ];
 
   /* doConfigure should be specified separately */
-  phaseNames = ["setVars" "paranoidFixComments" "doConfigure" (doPatchShebangs ".") 
+  phaseNames = ["setVars" /* "paranoidFixComments" */ "doConfigure" (doPatchShebangs ".") 
     "doReplaceUsrBin" "doMakeInstall" "doAddPrograms"];
 
   setVars = fullDepEntry (''
diff --git a/pkgs/development/libraries/webkit/src-for-default.nix b/pkgs/development/libraries/webkit/src-for-default.nix
index 2714ecb8c10d..c13b8caca792 100644
--- a/pkgs/development/libraries/webkit/src-for-default.nix
+++ b/pkgs/development/libraries/webkit/src-for-default.nix
@@ -1,9 +1,9 @@
 rec {
-   version="r61173";
-   name="webkit-r61173";
-   hash="1gmqgf3scbac682dkbzrfkl876y46j8rxd9asjqcx7xm4m6hrlkn";
-   url="http://builds.nightly.webkit.org/files/trunk/src/WebKit-r61173.tar.bz2";
-   advertisedUrl="http://builds.nightly.webkit.org/files/trunk/src/WebKit-r61173.tar.bz2";
+   version="r62241";
+   name="webkit-r62241";
+   hash="0ymymv6ls6r1yb75r7il9j1b2kc62nqbdwmivphgpms6idpbrx46";
+   url="http://builds.nightly.webkit.org/files/trunk/src/WebKit-r62241.tar.bz2";
+   advertisedUrl="http://builds.nightly.webkit.org/files/trunk/src/WebKit-r62241.tar.bz2";
   
   
 }