diff --git a/pkgs/development/libraries/science/chemistry/molequeue/default.nix b/pkgs/development/libraries/science/chemistry/molequeue/default.nix
index 1e8ca2d961d3..b560ac16c698 100644
--- a/pkgs/development/libraries/science/chemistry/molequeue/default.nix
+++ b/pkgs/development/libraries/science/chemistry/molequeue/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     owner = "OpenChemistry";
     repo = pname;
     rev = version;
-    sha256 = "+NoY8YVseFyBbxc3ttFWiQuHQyy1GN8zvV1jGFjmvLg=";
+    hash = "sha256-+NoY8YVseFyBbxc3ttFWiQuHQyy1GN8zvV1jGFjmvLg=";
   };
 
   nativeBuildInputs = [
@@ -18,9 +18,10 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ qttools ];
 
-  postFixup = ''
-    substituteInPlace $out/lib/cmake/molequeue/MoleQueueConfig.cmake \
-      --replace "''${MoleQueue_INSTALL_PREFIX}/$out" "''${MoleQueue_INSTALL_PREFIX}"
+  # Fix the broken CMake files to use the correct paths
+  postInstall = ''
+    substituteInPlace $out/lib/cmake/${pname}/MoleQueueConfig.cmake \
+      --replace "$out/" ""
   '';
 
   meta = with lib; {