diff --git a/pkgs/development/libraries/haskell/deepseq/1.2.0.1.nix b/pkgs/development/libraries/haskell/deepseq/1.2.0.1.nix
new file mode 100644
index 000000000000..35fca66fa869
--- /dev/null
+++ b/pkgs/development/libraries/haskell/deepseq/1.2.0.1.nix
@@ -0,0 +1,16 @@
+{ cabal }:
+
+cabal.mkDerivation (self: {
+  pname = "deepseq";
+  version = "1.2.0.1";
+  sha256 = "0r7lkqhllj7phmn4sq836fmis4wy9fpka4hjzhqzhbbykzys0z7d";
+  meta = {
+    description = "Deep evaluation of data structures";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [
+      self.stdenv.lib.maintainers.andres
+      self.stdenv.lib.maintainers.simons
+    ];
+  };
+})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 71054c3e961f..2ada2215c5ad 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -511,6 +511,7 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
 
   deepseq_1_1_0_0 = callPackage ../development/libraries/haskell/deepseq/1.1.0.0.nix {};
   deepseq_1_1_0_2 = callPackage ../development/libraries/haskell/deepseq/1.1.0.2.nix {};
+  deepseq_1_2_0_1 = callPackage ../development/libraries/haskell/deepseq/1.2.0.1.nix {};
   deepseq = self.deepseq_1_1_0_0;
 
   derive = callPackage ../development/libraries/haskell/derive {};