diff --git a/tp-number-input.js b/tp-number-input.js
index 72bc845..a3cfd4b 100644
--- a/tp-number-input.js
+++ b/tp-number-input.js
@@ -49,7 +49,7 @@ class TpNumberInput extends FormElement(EventHelpers(DomQuery(LitElement))) {
     const { disabled, invalid, errorMessage, required, autofocus, _internValue } = this;
 
     return html`
-      <tp-input id="input" exportparts="wrap" .disabled=${disabled} .invalid=${invalid} .value=${_internValue} .autofocus=${autofocus} .errorMessage=${errorMessage} .required=${required}>
+      <tp-input id="input" exportparts="wrap, error-message" .disabled=${disabled} .invalid=${invalid} .value=${_internValue} .autofocus=${autofocus} .errorMessage=${errorMessage} .required=${required}>
         <div slot="prefix">
           <tp-icon id="sub" part="icons" .icon=${this.decreaseIcon || TpNumberInput.defaultDecreaseIcon} .tooltip=${this.decreaseTooltip}></tp-icon>
         </div>