diff --git a/nodes/core/hardware/36-rpi-gpio.html b/nodes/core/hardware/36-rpi-gpio.html
index 2d3e69b82..2b62a4f5b 100644
--- a/nodes/core/hardware/36-rpi-gpio.html
+++ b/nodes/core/hardware/36-rpi-gpio.html
@@ -18,7 +18,7 @@
     <div class="form-row">
         <label for="node-input-pin"><i class="icon-asterisk"></i> GPIO Pin</label>
         <select type="text" id="node-input-pin" style="width: 150px;">
-            <option value="-">select pin </option>
+            <option value="-" disabled>select pin </option>
             <option value="3">3 - SDA0 </option>
             <option value="5">5 - SCL0 </option>
             <option value="7">7 - GPIO7</option>