diff --git a/tests/components/obihai/__init__.py b/tests/components/obihai/__init__.py
index 183f07aa00f..d43aa6a9bb8 100644
--- a/tests/components/obihai/__init__.py
+++ b/tests/components/obihai/__init__.py
@@ -12,7 +12,7 @@ USER_INPUT = {
 DHCP_SERVICE_INFO = dhcp.DhcpServiceInfo(
     hostname="obi200",
     ip="192.168.1.100",
-    macaddress="9CADEF000000",
+    macaddress="9cadef000000",
 )