diff --git a/pkgs/applications/science/math/calc/default.nix b/pkgs/applications/science/math/calc/default.nix
index 41adb1cfbe6c..d521da2f114c 100644
--- a/pkgs/applications/science/math/calc/default.nix
+++ b/pkgs/applications/science/math/calc/default.nix
@@ -3,14 +3,14 @@
 
 stdenv.mkDerivation rec {
   pname = "calc";
-  version = "2.14.1.0";
+  version = "2.14.1.2";
 
   src = fetchurl {
     urls = [
-      "https://github.com/lcn2/calc/releases/download/${version}/${pname}-${version}.tar.bz2"
+      "https://github.com/lcn2/calc/releases/download/v${version}/${pname}-${version}.tar.bz2"
       "http://www.isthe.com/chongo/src/calc/${pname}-${version}.tar.bz2"
     ];
-    sha256 = "sha256-C1YWZS4x7htUWF3MhRLQIYChL4rdwJxASdPQjttUr0A=";
+    sha256 = "sha256-3o8jKmEYxNQtExOkjqTVU24mtSok+T/RnRw6goNzThM=";
   };
 
   postPatch = ''