diff --git a/phpgwapi/inc/class.phpmailer.inc.php b/phpgwapi/inc/class.phpmailer.inc.php
index 2d1bdf7941..206ad0cb09 100644
--- a/phpgwapi/inc/class.phpmailer.inc.php
+++ b/phpgwapi/inc/class.phpmailer.inc.php
@@ -1295,7 +1295,7 @@ class PHPMailer {
       $encoding = $this->Encoding;
     }
     $result .= $this->TextLine('--' . $boundary);
-    $result .= sprintf("Content-Type: %s; charset =\"%s\"", $contentType, $charSet);
+    $result .= sprintf("Content-Type: %s; charset=\"%s\"", $contentType, $charSet);
     $result .= $this->LE;
     $result .= $this->HeaderLine('Content-Transfer-Encoding', $encoding);
     $result .= $this->LE;