diff --git a/bench/int_to_bluetooth_address.py b/bench/int_to_bluetooth_address.py
new file mode 100644
index 0000000..ea92e67
--- /dev/null
+++ b/bench/int_to_bluetooth_address.py
@@ -0,0 +1,12 @@
+import timeit
+
+from bluetooth_data_tools.utils import _int_to_bluetooth_address
+
+
+def parse_adv() -> None:
+    _int_to_bluetooth_address(0)
+
+
+count = 10000000
+time = timeit.Timer(parse_adv).timeit(count)
+print(f"Parsing {count} bluetooth addresses took {time} seconds")
diff --git a/build_ext.py b/build_ext.py
index 9ddd870..94130b9 100644
--- a/build_ext.py
+++ b/build_ext.py
@@ -15,7 +15,7 @@
     [
         join("src", "bluetooth_data_tools", "_utils_impl.pyx"),
     ],
-    language="c++",
+    language="c",
 )