diff --git a/src/wp-includes/comment-template.php b/src/wp-includes/comment-template.php
index 4254abfd01..c7404924f1 100644
--- a/src/wp-includes/comment-template.php
+++ b/src/wp-includes/comment-template.php
@@ -1091,12 +1091,20 @@ function get_trackback_url() {
  *                     for the result instead.
  */
 function trackback_url( $deprecated_echo = true ) {
-	if ( $deprecated_echo !== true )
-		_deprecated_argument( __FUNCTION__, '2.5', __('Use <code>get_trackback_url()</code> instead if you do not want the value echoed.') );
-	if ( $deprecated_echo )
+	if ( true !== $deprecated_echo ) {
+		_deprecated_argument( __FUNCTION__, '2.5',
+			/* translators: %s: get_trackback_url() */
+			sprintf( __( 'Use %s instead if you do not want the value echoed.' ),
+				'<code>get_trackback_url()</code>'
+			)
+		);
+	}
+
+	if ( $deprecated_echo ) {
 		echo get_trackback_url();
-	else
+	} else {
 		return get_trackback_url();
+	}
 }
 
 /**