diff --git a/hardware/Pi/37-rpi-piface.html b/hardware/Pi/37-rpi-piface.html
index d5472b28..fcb0a966 100644
--- a/hardware/Pi/37-rpi-piface.html
+++ b/hardware/Pi/37-rpi-piface.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="Button S1">Button S1</option>
             <option value="Button S2">Button S2</option>
             <option value="Button S3">Button S3</option>
@@ -85,7 +85,7 @@
     <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="LED 0 / Relay 0">LED 0 / Relay 0</option>
             <option value="LED 1 / Relay 1">LED 1 / Relay 1</option>
             <option value="LED 2">LED 2</option>
diff --git a/hardware/Pi/38-rpi-pibrella.html b/hardware/Pi/38-rpi-pibrella.html
index ffbe3ac8..f949e8ab 100644
--- a/hardware/Pi/38-rpi-pibrella.html
+++ b/hardware/Pi/38-rpi-pibrella.html
@@ -18,7 +18,7 @@
     <div class="form-row">
         <label for="node-input-pin"><i class="icon-asterisk"></i> Input</label>
         <select type="text" id="node-input-pin" style="width: 150px;">
-            <option value="-">select input</option>
+            <option value="-" disabled>select input</option>
             <option value="Red Button">Red Button</option>
             <option value="In A">In A</option>
             <option value="In B">In B</option>
@@ -64,7 +64,7 @@
     <div class="form-row">
         <label for="node-input-pin"><i class="icon-asterisk"></i> Output</label>
         <select type="text" id="node-input-pin" style="width: 150px;">
-            <option value="-">select output</option>
+            <option value="-" disabled>select output</option>
             <option value="Red LED">Red LED</option>
             <option value="Amber LED">Amber LED</option>
             <option value="Green LED">Green LED</option>