diff --git a/index.html b/index.html
index a2d01fe..ab76d14 100644
--- a/index.html
+++ b/index.html
@@ -440,7 +440,7 @@
                 <div class="clearfix"></div>
                 <div class="col-lg-12 text-center">
                   <div id="success"></div>
-                  <button class="btn btn-xl" type="submit">Send Message</button>
+                  <button id="sendMessageButton" class="btn btn-xl" type="submit">Send Message</button>
                 </div>
               </div>
             </form>
diff --git a/js/contact_me.js b/js/contact_me.js
index 0e9a643..5323770 100644
--- a/js/contact_me.js
+++ b/js/contact_me.js
@@ -17,6 +17,8 @@ $(function() {
       if (firstName.indexOf(' ') >= 0) {
         firstName = name.split(' ').slice(0, -1).join(' ');
       }
+      $this = $("#sendMessageButton");
+      $this.prop("disabled", true); // Disable submit button until AJAX call is complete to prevent duplicate messages
       $.ajax({
         url: "././mail/contact_me.php",
         type: "POST",
@@ -49,6 +51,11 @@ $(function() {
           //clear all fields
           $('#contactForm').trigger("reset");
         },
+        complete: function () {
+             setTimeout(function () {
+             $this.prop("disabled", false); // Re-enable submit button when AJAX call is complete
+          }, 1000);
+        }
       });
     },
     filter: function() {