diff --git a/typo3/sysext/backend/Classes/Template/Components/Buttons/InputButton.php b/typo3/sysext/backend/Classes/Template/Components/Buttons/InputButton.php
index 70038435a21184cb2ae5e83ff93cad79d380b083..d83edb554a769d75d1c42ea27356f6c1e4bd87d6 100644
--- a/typo3/sysext/backend/Classes/Template/Components/Buttons/InputButton.php
+++ b/typo3/sysext/backend/Classes/Template/Components/Buttons/InputButton.php
@@ -118,7 +118,7 @@ class InputButton extends AbstractButton implements ButtonInterface {
 		$content = '
 		<button name="' .
 			htmlspecialchars($this->getName()) .
-			'" class="' .
+			'" class="btn btn-default btn-sm ' .
 			htmlspecialchars($this->getClasses()) .
 			'" value="' .
 			htmlspecialchars($this->getValue()) .