diff --git a/src/usr/local/www/diag_command.php b/src/usr/local/www/diag_command.php
index 5f5e5c56eb..aa07211a7d 100755
--- a/src/usr/local/www/diag_command.php
+++ b/src/usr/local/www/diag_command.php
@@ -322,7 +322,7 @@ END_FILE;
 
 		$output = $matches = array();
 		$retval = 0;
-		exec("/usr/local/bin/php -d log_errors=off {$tmpfile}", $output, $ret_val);
+		exec("/usr/local/bin/php -d log_errors=off {$tmpfile}", $output, $retval);
 
 		puts('<div class="panel panel-success responsive"><div class="panel-heading"><h2 class="panel-title">PHP Response</h2></div>');