diff --git a/ui/index.jsp b/ui/index.jsp
index edfd4e3edc9..7b8d8257b33 100644
--- a/ui/index.jsp
+++ b/ui/index.jsp
@@ -208,15 +208,15 @@
                                 <div class="section custom-size">
                                     <div class="field">
                                         <label><fmt:message key="label.num.cpu.cores"/></label>
-                                        <input type="text" name="compute-cpu-cores" />
+                                        <input type="text" class="required disallowSpecialCharacters" name="compute-cpu-cores" />
                                     </div>
                                     <div class="field">
                                         <label><fmt:message key="label.cpu.mhz"/></label>
-                                        <input type="text" name="compute-cpu" />
+                                        <input type="text" class="required disallowSpecialCharacters" name="compute-cpu" />
                                     </div>
                                     <div class="field">
                                         <label><fmt:message key="label.memory.mb"/></label>
-                                        <input type="text" name="compute-memory" />
+                                        <input type="text" class="required disallowSpecialCharacters" name="compute-memory" />
                                     </div>
                                 </div>
                             </div>