diff --git a/htdocs/core/class/dolgraph.class.php b/htdocs/core/class/dolgraph.class.php
index cfce9449f87..e2311c883d6 100644
--- a/htdocs/core/class/dolgraph.class.php
+++ b/htdocs/core/class/dolgraph.class.php
@@ -112,6 +112,11 @@ class DolGraph
 		$this->datacolor = array(array(120, 130, 150), array(160, 160, 180), array(190, 190, 220));
 		$this->bgcolor = array(235, 235, 224);
 
+		// For small screen, we prefer a default with of 300
+		if (!empty($conf->dol_optimize_smallscreen)) {
+			$this->width = 300;
+		}
+
 		// Load color of the theme
 		$color_file = DOL_DOCUMENT_ROOT . '/theme/' . $conf->theme . '/theme_vars.inc.php';
 		if (is_readable($color_file)) {