diff --git a/LadybugTools_Engine/Python/src/ladybugtools_toolkit/external_comfort/material.py b/LadybugTools_Engine/Python/src/ladybugtools_toolkit/external_comfort/material.py
index 30fe35af..f4d00195 100644
--- a/LadybugTools_Engine/Python/src/ladybugtools_toolkit/external_comfort/material.py
+++ b/LadybugTools_Engine/Python/src/ladybugtools_toolkit/external_comfort/material.py
@@ -193,7 +193,7 @@ def get_identifier(material_identifier: str) -> str:
     material_identifier = re.sub(keep_characters, "_", material_identifier).replace("__", "_").rstrip()
     
     # prepend `Material_` to identifiers which start with a number
-    if re.match("^\d", material_identifier):
+    if re.match(r"^\d", material_identifier):
         material_identifier = f"Material_{material_identifier}"
 
     return material_identifier
diff --git a/LadybugTools_Engine/Python/tests/test_wind.py b/LadybugTools_Engine/Python/tests/test_wind.py
index 5c62e496..acb3a4e6 100644
--- a/LadybugTools_Engine/Python/tests/test_wind.py
+++ b/LadybugTools_Engine/Python/tests/test_wind.py
@@ -181,7 +181,8 @@ def test_bin_data():
 
 def test_prevailing():
     """_"""
-    assert TEST_WIND.prevailing()[0] == (355.0, 5.0)
+    assert TEST_WIND.prevailing(ignore_calm=False)[0] == (355.0, 5.0)
+    assert TEST_WIND.prevailing()[0] == (205.0, 215.0)
 
 
 def test_probabilities():