diff --git a/pkgs/applications/science/math/calc/default.nix b/pkgs/applications/science/math/calc/default.nix
index 2df68b49e67..c5a3fd606c0 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 = "2.12.9.0";
+  version = "2.12.9.1";
 
   src = fetchurl {
     urls = [
       "https://github.com/lcn2/calc/releases/download/${version}/${pname}-${version}.tar.bz2"
       "http://www.isthe.com/chongo/src/calc/${pname}-${version}.tar.bz2"
     ];
-    sha256 = "sha256-334WUhPG30U72hwzpHAZRNdmr/uBleOvEhu3rW9d5dM=";
+    sha256 = "sha256-B3ko+RNT+LYSJG1P5cujgRMc1OJhDPqm1ONrMh+7fI4=";
   };
 
   postPatch = ''