diff --git a/lib/licenses.nix b/lib/licenses.nix
index a4ac08bb20e9..4c07797b16c2 100644
--- a/lib/licenses.nix
+++ b/lib/licenses.nix
@@ -524,12 +524,6 @@ lib.mapAttrs (n: v: v // { shortName = n; }) {
     fullName = "Microsoft Public License";
   };
 
-  msrla = {
-    fullName  = "Microsoft Research License Agreement";
-    url       = "http://research.microsoft.com/en-us/projects/pex/msr-la.txt";
-    free = false;
-  };
-
   nasa13 = spdx {
     spdxId = "NASA-1.3";
     fullName = "NASA Open Source Agreement 1.3";
diff --git a/pkgs/applications/science/logic/verifast/default.nix b/pkgs/applications/science/logic/verifast/default.nix
index c5e8078eff2a..49618d2586b1 100644
--- a/pkgs/applications/science/logic/verifast/default.nix
+++ b/pkgs/applications/science/logic/verifast/default.nix
@@ -43,7 +43,7 @@ stdenv.mkDerivation rec {
   meta = {
     description = "Verification for C and Java programs via separation logic";
     homepage    = "http://people.cs.kuleuven.be/~bart.jacobs/verifast/";
-    license     = stdenv.lib.licenses.msrla;
+    license     = stdenv.lib.licenses.mit;
     platforms   = [ "x86_64-linux" ];
     maintainers = [ stdenv.lib.maintainers.thoughtpolice ];
   };