diff --git a/htdocs/core/lib/pdf.lib.php b/htdocs/core/lib/pdf.lib.php
index 206fbb7b1c4..97425c00465 100644
--- a/htdocs/core/lib/pdf.lib.php
+++ b/htdocs/core/lib/pdf.lib.php
@@ -2510,6 +2510,8 @@ function pdf_getSizeForImage($realpath)
 	$maxheight = (empty($conf->global->MAIN_DOCUMENTS_WITH_PICTURE_HEIGHT) ? 32 : $conf->global->MAIN_DOCUMENTS_WITH_PICTURE_HEIGHT);
 	include_once DOL_DOCUMENT_ROOT.'/core/lib/images.lib.php';
 	$tmp = dol_getImageSize($realpath);
+	$width = 0;
+    $height = 0;
 	if ($tmp['height']) {
 		$width = (int) round($maxheight * $tmp['width'] / $tmp['height']); // I try to use maxheight
 		if ($width > $maxwidth) {	// Pb with maxheight, so i use maxwidth