diff --git a/source/blender/python/generic/CMakeLists.txt b/source/blender/python/generic/CMakeLists.txt
index 0daa887c937..ea38e94070b 100644
--- a/source/blender/python/generic/CMakeLists.txt
+++ b/source/blender/python/generic/CMakeLists.txt
@@ -20,6 +20,7 @@ set(SRC
   imbuf_py_api.cc
   py_capi_rna.cc
   py_capi_utils.cc
+  python_compat.cc
 
   bl_math_py_api.hh
   blf_py_api.hh
@@ -28,9 +29,9 @@ set(SRC
   imbuf_py_api.hh
   py_capi_rna.hh
   py_capi_utils.hh
+  python_compat.hh
 
   # header-only
-  python_compat.hh
   python_utildefines.hh
 )
 
diff --git a/source/blender/python/generic/python_compat.cc b/source/blender/python/generic/python_compat.cc
new file mode 100644
index 00000000000..c72a4c897c4
--- /dev/null
+++ b/source/blender/python/generic/python_compat.cc
@@ -0,0 +1,76 @@
+
+/* SPDX-FileCopyrightText: 2025 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup pygen
+ *
+ * Functions relating to compatibility across Python versions.
+ */
+
+#include <Python.h> /* IWYU pragma: keep. */
+
+#include "BLI_utildefines.h" /* IWYU pragma: keep. */
+#include "python_compat.hh"  /* IWYU pragma: keep. */
+
+#if PY_VERSION_HEX >= 0x030e0000 /* >=3.14 */
+
+/* Removed in Python 3.14. */
+int _PyArg_CheckPositional(const char *name, Py_ssize_t nargs, Py_ssize_t min, Py_ssize_t max)
+{
+  BLI_assert(min >= 0);
+  BLI_assert(min <= max);
+
+  if (nargs < min) {
+    if (name != nullptr) {
+      PyErr_Format(PyExc_TypeError,
+                   "%.200s expected %s%zd argument%s, got %zd",
+                   name,
+                   (min == max ? "" : "at least "),
+                   min,
+                   min == 1 ? "" : "s",
+                   nargs);
+    }
+    else {
+      PyErr_Format(PyExc_TypeError,
+                   "unpacked tuple should have %s%zd element%s,"
+                   " but has %zd",
+                   (min == max ? "" : "at least "),
+                   min,
+                   min == 1 ? "" : "s",
+                   nargs);
+    }
+    return 0;
+  }
+
+  if (nargs == 0) {
+    return 1;
+  }
+
+  if (nargs > max) {
+    if (name != nullptr) {
+      PyErr_Format(PyExc_TypeError,
+                   "%.200s expected %s%zd argument%s, got %zd",
+                   name,
+                   (min == max ? "" : "at most "),
+                   max,
+                   max == 1 ? "" : "s",
+                   nargs);
+    }
+    else {
+      PyErr_Format(PyExc_TypeError,
+                   "unpacked tuple should have %s%zd element%s,"
+                   " but has %zd",
+                   (min == max ? "" : "at most "),
+                   max,
+                   max == 1 ? "" : "s",
+                   nargs);
+    }
+    return 0;
+  }
+
+  return 1;
+}
+
+#endif
diff --git a/source/blender/python/generic/python_compat.hh b/source/blender/python/generic/python_compat.hh
index 58f36280423..a44faf99b73 100644
--- a/source/blender/python/generic/python_compat.hh
+++ b/source/blender/python/generic/python_compat.hh
@@ -48,6 +48,7 @@
 #if PY_VERSION_HEX < 0x030e0000
 #  define Py_HashPointer _Py_HashPointer
 #  define PyThreadState_GetUnchecked _PyThreadState_UncheckedGet
-
 /* TODO: Support: `PyDict_Pop`, it has different arguments. */
+#else /* >= 3.14 */
+int _PyArg_CheckPositional(const char *name, Py_ssize_t nargs, Py_ssize_t min, Py_ssize_t max);
 #endif
diff --git a/source/blender/python/mathutils/mathutils_geometry.cc b/source/blender/python/mathutils/mathutils_geometry.cc
index 4d31c2005e9..a7d22caa04b 100644
--- a/source/blender/python/mathutils/mathutils_geometry.cc
+++ b/source/blender/python/mathutils/mathutils_geometry.cc
@@ -29,6 +29,7 @@
 #include "BLI_utildefines.h"
 
 #include "../generic/py_capi_utils.hh"
+#include "../generic/python_compat.hh" /* IWYU pragma: keep. */
 #include "../generic/python_utildefines.hh"
 
 /* ---------------------------------INTERSECTION FUNCTIONS-------------------- */