diff --git a/scripts/writesensor.mako.cpp b/scripts/writesensor.mako.cpp
index 813f940..2c8c0e4 100644
--- a/scripts/writesensor.mako.cpp
+++ b/scripts/writesensor.mako.cpp
@@ -99,7 +99,9 @@
         .mutability = Mutability(${mutability}),
     % if sensorName:
         .sensorName = "${sensorName}",
+        .sensorNameFunc = nullptr,
     % else:
+        .sensorName = "",
         .sensorNameFunc = ${sensorNameFunc},
     % endif
         .propertyInterfaces = {