diff --git a/changelog.d/+invalid-escape-sequences.fixed b/changelog.d/+invalid-escape-sequences.fixed
new file mode 100644
index 00000000..f89789c4
--- /dev/null
+++ b/changelog.d/+invalid-escape-sequences.fixed
@@ -0,0 +1 @@
+Fix `SyntaxWarning: invalid escape sequence '\*'` emitted when `coreai_opt.quantization.config` is compiled on Python 3.12+ (and a `SyntaxError` under `python -W error`).
diff --git a/pyproject.toml b/pyproject.toml
index 23eb9e2b..f79a5734 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -263,6 +263,7 @@ select = [
     "RUF100", # remove unused noqa pragmas
     "TC004",  # catch runtime imports in TYPE_CHECKING blocks
     "UP",     # apply pyupgrade modernization rules
+    "W605",   # invalid escape sequences (SyntaxWarning since Python 3.12)
 ]
 ignore = [
     "ANN401", # allow type `Any`.
diff --git a/src/coreai_opt/quantization/config/quantization_config.py b/src/coreai_opt/quantization/config/quantization_config.py
index e63858c3..0d434fcc 100644
--- a/src/coreai_opt/quantization/config/quantization_config.py
+++ b/src/coreai_opt/quantization/config/quantization_config.py
@@ -169,7 +169,7 @@ def __init__(self, execution_mode: object) -> None:
 
 
 class OpQuantizerConfig(OpCompressionConfig[QuantizationSpec]):
-    """
+    r"""
     Configuration class for quantization at the operation level.
 
     This class specifies quantization settings for inputs, outputs, and state
@@ -271,7 +271,7 @@ def get_default_state_spec(cls) -> dict[str, QuantizationSpec | None]:
 
 @final
 class ModuleQuantizerConfig(ModuleCompressionConfig[OpQuantizerConfig, QuantizationSpec]):
-    """
+    r"""
     Configuration class for quantization at the module level.
 
     This class manages quantization settings for an entire module, including:
diff --git a/tests/quantization/test_annotation_pattern_registry.py b/tests/quantization/test_annotation_pattern_registry.py
index 66b006a8..c1906dcf 100644
--- a/tests/quantization/test_annotation_pattern_registry.py
+++ b/tests/quantization/test_annotation_pattern_registry.py
@@ -3414,7 +3414,7 @@ def test_none_configs(self, config, expected):
                 QuantizerConfig(
                     global_config=None,
                     module_name_configs={
-                        "inner_module\.linear_out.*": ModuleQuantizerConfig(
+                        r"inner_module\.linear_out.*": ModuleQuantizerConfig(
                             op_state_spec=None,
                             module_state_spec={"weight": default_weight_quantization_spec()},
                         )
@@ -3508,7 +3508,7 @@ def test_module_level_setting_precedence(self):
                 )
             },
             module_name_configs={
-                "inner_module\.linear_out1": ModuleQuantizerConfig(
+                r"inner_module\.linear_out1": ModuleQuantizerConfig(
                     op_input_spec=None,
                     op_output_spec=None,
                     op_state_spec=None,
@@ -4156,7 +4156,7 @@ def test_shared_param_precedence(
                         )
                     },
                 ),
-                "Only integer indices or '\*' are supported",
+                r"Only integer indices or '\*' are supported",
             ),
             (
                 QuantizerConfig(
@@ -4167,7 +4167,7 @@ def test_shared_param_precedence(
                         )
                     },
                 ),
-                "Only integer indices or '\*' are supported",
+                r"Only integer indices or '\*' are supported",
             ),
             (
                 QuantizerConfig(
diff --git a/tests/test_source_compiles.py b/tests/test_source_compiles.py
new file mode 100644
index 00000000..09cbe5a4
--- /dev/null
+++ b/tests/test_source_compiles.py
@@ -0,0 +1,25 @@
+# Copyright 2026 Apple Inc.
+#
+# Use of this source code is governed by a BSD-3-Clause license that can
+# be found in the LICENSE file or at https://opensource.org/licenses/BSD-3-Clause
+
+"""Check that the package source compiles without warnings."""
+
+import warnings
+from pathlib import Path
+
+import pytest
+
+import coreai_opt
+
+_SRC_ROOT = Path(coreai_opt.__file__).parent
+_SOURCE_FILES = sorted(_SRC_ROOT.rglob("*.py"))
+
+
+@pytest.mark.parametrize("path", _SOURCE_FILES, ids=lambda p: str(p.relative_to(_SRC_ROOT.parent)))
+def test_source_compiles_without_warnings(path: Path) -> None:
+    # Things like invalid escape sequences only warn at compile time, and the
+    # warning is lost once a .pyc is cached, so compile from source directly.
+    with warnings.catch_warnings():
+        warnings.simplefilter("error")
+        compile(path.read_text(encoding="utf-8"), str(path), "exec")