diff --git a/src/__init__.py b/src/__init__.py
index e69de29b..fd2235c7 100644
--- a/src/__init__.py
+++ b/src/__init__.py
@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+import os
+
+
+_NATIVE_THREAD_ENV_DEFAULTS = {
+    "OMP_NUM_THREADS": "1",
+    "OPENBLAS_NUM_THREADS": "1",
+    "MKL_NUM_THREADS": "1",
+    "NUMEXPR_NUM_THREADS": "1",
+}
+
+for _name, _value in _NATIVE_THREAD_ENV_DEFAULTS.items():
+    os.environ.setdefault(_name, _value)