diff --git a/nixos/tests/tracee.nix b/nixos/tests/tracee.nix
index 72e82ec0b7e..6ef7e5342be 100644
--- a/nixos/tests/tracee.nix
+++ b/nixos/tests/tracee.nix
@@ -18,7 +18,7 @@ import ./make-test-python.nix ({ pkgs, ... }: {
           buildPhase = ''
             runHook preBuild
             # just build the static lib we need for the go test binary
-            make $makeFlags ''${enableParallelBuilding:+-j$NIX_BUILD_CORES -l$NIX_BUILD_CORES} bpf-core ./dist/btfhub
+            make $makeFlags ''${enableParallelBuilding:+-j$NIX_BUILD_CORES} bpf-core ./dist/btfhub
 
             # remove the /usr/bin prefix to work with the patch above
             substituteInPlace tests/integration/integration_test.go \
diff --git a/pkgs/development/python-modules/pyqt/6.x.nix b/pkgs/development/python-modules/pyqt/6.x.nix
index 157553b9596..fce9308093e 100644
--- a/pkgs/development/python-modules/pyqt/6.x.nix
+++ b/pkgs/development/python-modules/pyqt/6.x.nix
@@ -59,7 +59,7 @@ buildPythonPackage rec {
   # pkgs/development/interpreters/python/hooks/pip-build-hook.sh
   # does not use the enableParallelBuilding flag
   postUnpack = ''
-    export MAKEFLAGS+=" -j$NIX_BUILD_CORES -l$NIX_BUILD_CORES"
+    export MAKEFLAGS+=" -j$NIX_BUILD_CORES"
   '';
 
   outputs = [ "out" "dev" ];
diff --git a/pkgs/development/python-modules/pyqt6-webengine.nix b/pkgs/development/python-modules/pyqt6-webengine.nix
index 96fa057a47c..564d1a14325 100644
--- a/pkgs/development/python-modules/pyqt6-webengine.nix
+++ b/pkgs/development/python-modules/pyqt6-webengine.nix
@@ -40,7 +40,7 @@ buildPythonPackage rec {
   # pkgs/development/interpreters/python/hooks/pip-build-hook.sh
   # does not use the enableParallelBuilding flag
   postUnpack = ''
-    export MAKEFLAGS+=" -j$NIX_BUILD_CORES -l$NIX_BUILD_CORES"
+    export MAKEFLAGS+=" -j$NIX_BUILD_CORES"
   '';
 
   outputs = [ "out" "dev" ];