diff --git a/flake.nix b/flake.nix
index 0dfbe76..a208ed6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -516,6 +516,21 @@
           
               doCheck = false;
             };
+          buildPlShExt = versionSuffix: let
+	      version = "4.0"; 
+            in buildPostgresqlExtension prev {
+              postgresql = prev."postgresql_${versionSuffix}";
+            } {
+              pname = "plhaskell";
+              inherit version;
+              src = prev.fetchFromGitHub {
+                owner = "petere";
+                repo = "plsh";
+                rev = "d88079617309974f71b3f8e4d5f96869dba66835";
+                hash = lib.fakeHash;
+              };
+              nativeBuildInputs = with prev; [pkg-config curl ghc haskellPackages.hsc2hs haskellPackages.HSFFIG];
+            };
           buildPlHaskellExt = versionSuffix: let
 	      version = "4.0"; 
             in buildPostgresqlExtension prev {
@@ -552,6 +567,7 @@
             http = buildHttpExt "17";
             pg_smtp_client = buildSmtpExt "17";
             plhaskell = buildPlHaskellExt "17";
+            plsh = buildPlShExt "17";
             hemar = buildHemarExt prev "17";
           };};
           postgresql_16 = prev.postgresql_16 // {pkgs = prev.postgresql_16.pkgs // {
@@ -564,6 +580,7 @@
             http = buildHttpExt "15";
             pg_smtp_client = buildSmtpExt "15";
             plhaskell = buildPlHaskellExt "15";
+            plsh = buildPlShExt "15";
             hemar = buildHemarExt prev "15";
           };};
           postgresql_14 = prev.postgresql_14 // {pkgs = prev.postgresql_14.pkgs // {