diff --git a/wp-includes/media.php b/wp-includes/media.php
index df96a17cf8..086d50ea45 100644
--- a/wp-includes/media.php
+++ b/wp-includes/media.php
@@ -1142,7 +1142,7 @@ function wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attac
 	 * @param array  $size_array    Array of width and height values in pixels (in that order).
 	 * @param string $image_src     The 'src' of the image.
 	 * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
- 	 * @param int    $attachment_id Image attachment ID or 0.
+	 * @param int    $attachment_id Image attachment ID or 0.
 	 */
 	$sources = apply_filters( 'wp_calculate_image_srcset', $sources, $size_array, $image_src, $image_meta, $attachment_id );
 
@@ -1154,7 +1154,7 @@ function wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attac
 	$srcset = '';
 
 	foreach ( $sources as $source ) {
-		$srcset .= $source['url'] . ' ' . $source['value'] . $source['descriptor'] . ', ';
+		$srcset .= str_replace( ' ', '%20', $source['url'] ) . ' ' . $source['value'] . $source['descriptor'] . ', ';
 	}
 
 	return rtrim( $srcset, ', ' );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 7928221283..af3348fd3b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-beta2-38051';
+$wp_version = '4.6-beta2-38052';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.