diff --git a/master/custom/builders.py b/master/custom/builders.py
index 32350fe5..e7d3e887 100644
--- a/master/custom/builders.py
+++ b/master/custom/builders.py
@@ -330,6 +330,11 @@
     ("PPC64LE Fedora Rawhide NoGIL refleaks", "cstratak-fedora-rawhide-ppc64le", UnixNoGilRefleakBuild),
     ("s390x Fedora Rawhide NoGIL refleaks", "cstratak-fedora-rawhide-s390x", UnixNoGilRefleakBuild),
 
+    # Linux x86-64 NixOS Unstable
+    ("AMD64 NixOS Unstable", "malvex-nixos-x86_64", UnixBuild),
+    ("AMD64 NixOS Unstable Refleaks", "malvex-nixos-x86_64", UnixRefleakBuild),
+    ("AMD64 NixOS Unstable Perf", "malvex-nixos-x86_64", UnixPerfBuild),
+
     # AIX ppc64
     ("PPC64 AIX", "edelsohn-aix-ppc64", AIXBuild),
     ("PPC64 AIX XLC", "edelsohn-aix-ppc64", AIXBuildWithXLC),
diff --git a/master/custom/workers.py b/master/custom/workers.py
index 110a342e..733f9ef4 100644
--- a/master/custom/workers.py
+++ b/master/custom/workers.py
@@ -341,4 +341,9 @@ def get_workers(settings):
             not_branches=['3.10', '3.11', '3.12'],
             parallel_builders=1,  # All builds use the same emulator and app ID.
         ),
+        cpw(
+            name="malvex-nixos-x86_64",
+            tags=['linux', 'unix', 'nixos', 'amd64', 'x86-64'],
+            parallel_tests=10,
+        ),
     ]