diff --git a/wp-includes/media.php b/wp-includes/media.php
index 9afb105268..6e597a9460 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -1578,7 +1578,7 @@ function img_caption_shortcode( $attr, $content = null ) {
 
 	$style = '';
 	if ( $caption_width ) {
-		$style = 'style="max-width: ' . (int) $caption_width . 'px" ';
+		$style = 'style="width: ' . (int) $caption_width . 'px" ';
 	}
 
 	if ( $html5 ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index f833ffc6b9..e2c7d95b60 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9.5-alpha-42831';
+$wp_version = '4.9.5-alpha-42838';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.