diff --git a/packages/block-library/src/image/index.php b/packages/block-library/src/image/index.php
index 7f84d5d2b7e5e2..d31070ff67fc42 100644
--- a/packages/block-library/src/image/index.php
+++ b/packages/block-library/src/image/index.php
@@ -229,7 +229,6 @@ class="lightbox-trigger"
 			type="button"
 			aria-haspopup="dialog"
 			aria-label="' . esc_attr( $aria_label ) . '"
-			aria-describedby="' . esc_attr( $alt ) . '"
 			data-wp-init="callbacks.initTriggerButton"
 			data-wp-on-async--click="actions.showLightbox"
 			data-wp-style--right="state.imageButtonRight"