diff --git a/src/Dependencies/RocketLazyload/Image.php b/src/Dependencies/RocketLazyload/Image.php
index bf09538..02e8528 100644
--- a/src/Dependencies/RocketLazyload/Image.php
+++ b/src/Dependencies/RocketLazyload/Image.php
@@ -256,11 +256,11 @@ public function lazyloadPictures( $html, $buffer ) {
 				continue;
 			}
 
+			$lazy_sources = 0;
+
 			if ( preg_match_all( '#<source(?<atts>\s.+)>#iUs', $picture['sources'], $sources, PREG_SET_ORDER ) ) {
 				$sources = array_unique( $sources, SORT_REGULAR );
 
-				$lazy_sources = 0;
-
 				foreach ( $sources as $source ) {
 					$lazyload_srcset = preg_replace( '/([\s"\'])srcset/i', '\1data-lazy-srcset', $source[0] );
 					$html            = str_replace( $source[0], $lazyload_srcset, $html );