Index: src/wp-admin/includes/file.php
===================================================================
--- src/wp-admin/includes/file.php	(revision 25860)
+++ src/wp-admin/includes/file.php	(working copy)
@@ -617,14 +617,16 @@
 			$needed_dirs[] = $to . untrailingslashit(dirname($info['name']));
 	}
 
-	/*
-	 * disk_free_space() could return false. Assume that any falsey value is an error.
-	 * A disk that has zero free bytes has bigger problems.
-	 * Require we have enough space to unzip the file and copy its contents, with a 10% buffer.
-	 */
-	$available_space = @disk_free_space( WP_CONTENT_DIR );
-	if ( $available_space && ( $uncompressed_size * 2.1 ) > $available_space )
-		return new WP_Error( 'disk_full_unzip_file', __( 'Could not copy files. You may have run out of disk space.' ), compact( 'uncompressed_size', 'available_space' ) );
+	if ( defined( 'DOING_CRON' ) && DOING_CRON ) {
+		/*
+		 * disk_free_space() could return false. Assume that any falsey value is an error.
+		 * A disk that has zero free bytes has bigger problems.
+		 * Require we have enough space to unzip the file and copy its contents, with a 10% buffer.
+		 */
+		$available_space = @disk_free_space( WP_CONTENT_DIR );
+		if ( $available_space && ( $uncompressed_size * 2.1 ) > $available_space )
+			return new WP_Error( 'disk_full_unzip_file', __( 'Could not copy files. You may have run out of disk space.' ), compact( 'uncompressed_size', 'available_space' ) );
+	}
 
 	$needed_dirs = array_unique($needed_dirs);
 	foreach ( $needed_dirs as $dir ) {
@@ -717,14 +719,16 @@
 		$needed_dirs[] = $to . untrailingslashit( $file['folder'] ? $file['filename'] : dirname($file['filename']) );
 	}
 
-	/*
-	 * disk_free_space() could return false. Assume that any falsey value is an error.
-	 * A disk that has zero free bytes has bigger problems.
-	 * Require we have enough space to unzip the file and copy its contents, with a 10% buffer.
-	 */
-	$available_space = @disk_free_space( WP_CONTENT_DIR );
-	if ( $available_space && ( $uncompressed_size * 2.1 ) > $available_space )
-		return new WP_Error( 'disk_full_unzip_file', __( 'Could not copy files. You may have run out of disk space.' ), compact( 'uncompressed_size', 'available_space' ) );
+	if ( defined( 'DOING_CRON' ) && DOING_CRON ) {
+		/*
+	 	 * disk_free_space() could return false. Assume that any falsey value is an error.
+	 	 * A disk that has zero free bytes has bigger problems.
+	 	 * Require we have enough space to unzip the file and copy its contents, with a 10% buffer.
+	 	 */
+		$available_space = @disk_free_space( WP_CONTENT_DIR );
+		if ( $available_space && ( $uncompressed_size * 2.1 ) > $available_space )
+			return new WP_Error( 'disk_full_unzip_file', __( 'Could not copy files. You may have run out of disk space.' ), compact( 'uncompressed_size', 'available_space' ) );
+	}
 
 	$needed_dirs = array_unique($needed_dirs);
 	foreach ( $needed_dirs as $dir ) {