diff --git a/pkgs/development/libraries/gsl/default.nix b/pkgs/development/libraries/gsl/default.nix
index 9afcc4ad41d..49364f88242 100644
--- a/pkgs/development/libraries/gsl/default.nix
+++ b/pkgs/development/libraries/gsl/default.nix
@@ -1,11 +1,11 @@
 { fetchurl, stdenv }:
 
 stdenv.mkDerivation rec {
-  name = "gsl-1.16";
+  name = "gsl-1.15";
 
   src = fetchurl {
     url = "mirror://gnu/gsl/${name}.tar.gz";
-    sha256 = "0lrgipi0z6559jqh82yx8n4xgnxkhzj46v96dl77hahdp58jzg3k";
+    sha256 = "18qf6jzz1r3mzb5qynywv4xx3z9g61hgkbpkdrhbgqh2g7jhgfc5";
   };
 
   doCheck = true;