diff --git a/nixos/tests/fenics.nix b/nixos/tests/fenics.nix
index f0a8c32c7cd8..1d182cfc4499 100644
--- a/nixos/tests/fenics.nix
+++ b/nixos/tests/fenics.nix
@@ -44,6 +44,6 @@ in
     { nodes, ... }:
     ''
       start_all()
-      node1.succeed("${fenicsScript}")
+      fenicsnode.succeed("${fenicsScript}")
     '';
 })
diff --git a/pkgs/development/libraries/science/math/fenics/default.nix b/pkgs/development/libraries/science/math/fenics/default.nix
index 2690d544c2c8..9ca4d6314c1e 100644
--- a/pkgs/development/libraries/science/math/fenics/default.nix
+++ b/pkgs/development/libraries/science/math/fenics/default.nix
@@ -243,8 +243,8 @@ let
       export CMAKE_PREFIX_PATH=${pybind11}/share/cmake/pybind11:$CMAKE_PREFIX_PATH
       substituteInPlace setup.py --replace "pybind11==2.2.4" "pybind11"
       substituteInPlace dolfin/jit/jit.py \
-        --replace 'pkg-config.exists("dolfin")' 'pkg-config.exists("${dolfin}/lib/pkgconfig/dolfin.pc")' \
-        --replace 'pkg-config.parse("dolfin")' 'pkg-config.parse("${dolfin}/lib/pkgconfig/dolfin.pc")'
+        --replace 'pkgconfig.exists("dolfin")' 'pkgconfig.exists("${dolfin}/lib/pkgconfig/dolfin.pc")' \
+        --replace 'pkgconfig.parse("dolfin")' 'pkgconfig.parse("${dolfin}/lib/pkgconfig/dolfin.pc")'
     '';
     buildInputs = [
       dolfin
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index f04e5766b6f9..4037d1b86f60 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2851,6 +2851,7 @@ in {
 
   fenics = callPackage ../development/libraries/science/math/fenics {
     hdf5 = pkgs.hdf5_1_10;
+    boost = pkgs.boost169;
   };
 
   ffcv = callPackage ../development/python-modules/ffcv { };