diff --git a/pkgs/by-name/op/openmolcas/package.nix b/pkgs/by-name/op/openmolcas/package.nix
index 6bca06f11afa4..e7de351234557 100644
--- a/pkgs/by-name/op/openmolcas/package.nix
+++ b/pkgs/by-name/op/openmolcas/package.nix
@@ -15,7 +15,7 @@
   libxc,
   makeWrapper,
   gsl,
-  boost,
+  boost188,
   autoPatchelfHook,
   enableQcmaquis ? true,
   # Note that the CASPT2 module is broken with MPI
@@ -29,6 +29,7 @@ assert blas-ilp64.isILP64;
 assert lapack-ilp64.isILP64;
 
 let
+  boost = boost188;
   python = python3.withPackages (
     ps: with ps; [
       six
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e6ef0add7e5f0..1fd311ea128fa 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -11601,10 +11601,6 @@ with pkgs;
     hdf5 = hdf5-fortran;
   };
 
-  openmolcas = callPackage ../by-name/op/openmolcas/package.nix {
-    boost = boost188;
-  };
-
   siesta-mpi = callPackage ../by-name/si/siesta/package.nix { useMpi = true; };
 
   ### SCIENCE/BIOLOGY