diff --git a/pkgs/data/fonts/droid/default.nix b/pkgs/data/fonts/droid/default.nix
index 0b5c00b877c..784dfe71007 100644
--- a/pkgs/data/fonts/droid/default.nix
+++ b/pkgs/data/fonts/droid/default.nix
@@ -3,34 +3,35 @@
 stdenv.mkDerivation rec {
   name = "font-droid-${version}";
   version = "2015-12-09";
+  at = "2776afefa9e0829076cd15fdc41e7950e2ffab82";
 
   srcs = [
     (fetchurl {
-      url = "https://github.com/google/fonts/raw/master/apache/droidsans/DroidSans.ttf";
+      url = "https://github.com/google/fonts/raw/${at}/apache/droidsans/DroidSans.ttf";
       sha256 = "1yml18dm86rrkihb2zz0ng8b1j2bb14hxc1d3hp0998vsr9s1w4h";
     })
     (fetchurl {
-      url = "https://github.com/google/fonts/raw/master/apache/droidsans/DroidSans-Bold.ttf";
+      url = "https://github.com/google/fonts/raw/${at}/apache/droidsans/DroidSans-Bold.ttf";
       sha256 = "1z61hz92d3l1pawmbc6iwi689v8rr0xlkx59pl89m1g9aampdrmh";
     })
     (fetchurl {
-      url = "https://github.com/google/fonts/raw/master/apache/droidsansmono/DroidSansMono.ttf";
+      url = "https://github.com/google/fonts/raw/${at}/apache/droidsansmono/DroidSansMono.ttf";
       sha256 = "0rzspxg457q4f4cp2wz93py13lbnqbhf12q4mzgy6j30njnjwl9h";
     })
     (fetchurl {
-      url = "https://github.com/google/fonts/raw/master/apache/droidserif/DroidSerif.ttf";
+      url = "https://github.com/google/fonts/raw/${at}/apache/droidserif/DroidSerif.ttf";
       sha256 = "1y7jzi7dz8j1yp8dxbmbvd6dpsck2grk3q1kd5rl7f31vlq5prj1";
     })
     (fetchurl {
-      url = "https://github.com/google/fonts/raw/master/apache/droidserif/DroidSerif-Bold.ttf";
+      url = "https://github.com/google/fonts/raw/${at}/apache/droidserif/DroidSerif-Bold.ttf";
       sha256 = "1c61b423sn5nnr2966jdzq6fy8pw4kg79cr3nbby83jsly389f9b";
     })
     (fetchurl {
-      url = "https://github.com/google/fonts/raw/master/apache/droidserif/DroidSerif-Italic.ttf";
+      url = "https://github.com/google/fonts/raw/${at}/apache/droidserif/DroidSerif-Italic.ttf";
       sha256 = "1bvrilgi0s72hiiv32hlxnzazslh3rbz8wgmsln0i9mnk7jr9bs0";
     })
     (fetchurl {
-      url = "https://github.com/google/fonts/raw/master/apache/droidserif/DroidSerif-BoldItalic.ttf";
+      url = "https://github.com/google/fonts/raw/${at}/apache/droidserif/DroidSerif-BoldItalic.ttf";
       sha256 = "052vlkmhy9c5nyk4byvhzya3y57fb09lqxd6spar6adf9ajbylgi";
     })
   ];