diff --git a/CHANGELOG b/CHANGELOG
index ac4f6432cd..290ebaf9f8 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -23,6 +23,7 @@ Cacti CHANGELOG
 -issue#2632: Automated Network Scans are Not Working
 -issue#2635: Multiple Database Sync Issues in v1.2.x
 -issue#2638: Support disabling PHP SNMP extension
+-issue#2645: The cacti setting 'base_url' may be incorrect for some systems.  Correct it.
 
 1.2.3
 -issue#1063: Tree View does not display the last item correctly under 'Modern' theme
diff --git a/lib/reports.php b/lib/reports.php
index 1ceaa2fe42..628fd4c2c3 100644
--- a/lib/reports.php
+++ b/lib/reports.php
@@ -853,7 +853,17 @@ function reports_graph_image($report, $item, $timespan, $output, $theme = 'class
 	}
 
 	if ($report['graph_linked'] == 'on' ) {
-		$out = "<a href='" . html_escape(read_config_option('base_url') . '/graph.php?action=view&local_graph_id='.$item['local_graph_id']."&rra_id=0") . "'>" . $out . '</a>';
+		if (substr(read_config_option('base_url'), 0, 4) != 'http') {
+			if (read_config_option('force_https') == 'on') {
+				$prefix = 'https://';
+			} else {
+				$prefix = 'http://';
+			}
+
+			set_config_option('base_url', $prefix . read_config_option('base_url'));
+		}
+
+		$out = "<a href='" . $prefix . html_escape(read_config_option('base_url', true) . '/graph.php?action=view&local_graph_id='.$item['local_graph_id']."&rra_id=0") . "'>" . $out . '</a>';
 	}
 
 	return $out . PHP_EOL;