diff --git a/toolkit/content/widgets/numberbox.xml b/toolkit/content/widgets/numberbox.xml
index 95c42666a18a..22538f753bc5 100644
--- a/toolkit/content/widgets/numberbox.xml
+++ b/toolkit/content/widgets/numberbox.xml
@@ -18,7 +18,7 @@
         <html:input class="numberbox-input textbox-input" flex="1" anonid="input"
                     xbl:inherits="onfocus,onblur,value,type,maxlength,disabled,size,readonly,tabindex,accesskey"/>
       </xul:hbox>
-      <xul:spinbuttons anonid="buttons" xbl:inherits="disabled"
+      <xul:spinbuttons anonid="buttons" xbl:inherits="disabled,hidden=hidespinbuttons"
                        onup="this.parentNode._modifyUp();"
                        ondown="this.parentNode._modifyDown();"/>
     </content>