diff --git a/components/tc_bus/protocol.h b/components/tc_bus/protocol.h
index 1ed0ff2..f658414 100644
--- a/components/tc_bus/protocol.h
+++ b/components/tc_bus/protocol.h
@@ -49,7 +49,7 @@ namespace esphome
         CommandData parseCommand(uint32_t command);
 
         const char* command_type_to_string(CommandType type);
-        const CommandType* string_to_command_type(char type);
+        const CommandType* string_to_command_type(std::string type);
 
     }  // namespace tc_bus
 }  // namespace esphome
\ No newline at end of file