diff --git a/buildroot/bin/opt_add b/buildroot/bin/opt_add
index 8ef7e07917..2c1eb30008 100755
--- a/buildroot/bin/opt_add
+++ b/buildroot/bin/opt_add
@@ -1,3 +1,3 @@
 #!/usr/bin/env bash
 
-eval "echo \"#define ${1} ${2}\" >>Marlin/Configuration_adv.h"
+eval "echo '#define ${@}' >>Marlin/Configuration_adv.h"