diff --git a/src/device.hpp b/src/device.hpp
index ded9130e3d..a9b14d7ce1 100644
--- a/src/device.hpp
+++ b/src/device.hpp
@@ -41,7 +41,7 @@ class Device {
 		virtual void program(unsigned int offset,
 				bool unprotect_flash) = 0;
 
-		virtual bool read_register(const std::string reg_name) { return false;}
+		virtual bool read_register(const std::string /*reg_name*/) { return false;}
 
 		/**********************/
 		/*    flash access    */