diff --git a/pkgs/servers/sql/postgresql/8.4.x.nix b/pkgs/servers/sql/postgresql/8.4.x.nix
index 0254bbe951d6..66933f2ad420 100644
--- a/pkgs/servers/sql/postgresql/8.4.x.nix
+++ b/pkgs/servers/sql/postgresql/8.4.x.nix
@@ -1,8 +1,7 @@
 { callPackage, fetchurl, ... } @ args:
 
 callPackage ./generic.nix (args // rec {
-  psqlSchema = "8.4";
-  version = "${psqlSchema}.22";
+  version = "8.4.22";
 
   src = fetchurl {
     url = "mirror://postgresql/source/v${version}/postgresql-${version}.tar.bz2";
diff --git a/pkgs/servers/sql/postgresql/9.0.x.nix b/pkgs/servers/sql/postgresql/9.0.x.nix
index dba42e4fb110..6c24e6aa4c45 100644
--- a/pkgs/servers/sql/postgresql/9.0.x.nix
+++ b/pkgs/servers/sql/postgresql/9.0.x.nix
@@ -1,8 +1,7 @@
 { callPackage, fetchurl, ... } @ args:
 
 callPackage ./generic.nix (args // rec {
-  psqlSchema = "9.0";
-  version = "${psqlSchema}.20";
+  version = "9.0.20";
 
   src = fetchurl {
     url = "mirror://postgresql/source/v${version}/postgresql-${version}.tar.bz2";
diff --git a/pkgs/servers/sql/postgresql/9.1.x.nix b/pkgs/servers/sql/postgresql/9.1.x.nix
index 138bc4a30232..b481f292ec54 100644
--- a/pkgs/servers/sql/postgresql/9.1.x.nix
+++ b/pkgs/servers/sql/postgresql/9.1.x.nix
@@ -1,8 +1,7 @@
 { callPackage, fetchurl, ... } @ args:
 
 callPackage ./generic.nix (args // rec {
-  psqlSchema = "9.1";
-  version = "${psqlSchema}.16";
+  version = "9.1.16";
 
   src = fetchurl {
     url = "mirror://postgresql/source/v${version}/postgresql-${version}.tar.bz2";
diff --git a/pkgs/servers/sql/postgresql/generic.nix b/pkgs/servers/sql/postgresql/generic.nix
index 721a3b6323f3..06e6d1e79d69 100644
--- a/pkgs/servers/sql/postgresql/generic.nix
+++ b/pkgs/servers/sql/postgresql/generic.nix
@@ -10,7 +10,7 @@
 , walBlockSizeKB ? 8, walSegmentSizeMB ? 16
 
 # Version specific arguments
-, version, src, psqlSchema
+, version, src
 , ...
 }:
 
@@ -90,7 +90,5 @@ stdenv.mkDerivation rec {
     hydraPlatforms = platforms.linux;
   };
 
-  passthru = {
-    inherit readline psqlSchema;
-  };
+  passthru = { inherit readline; };
 }