diff --git a/lib/portfoliolib.php b/lib/portfoliolib.php
index 4e05fd82fbe..83a8772992e 100644
--- a/lib/portfoliolib.php
+++ b/lib/portfoliolib.php
@@ -347,7 +347,7 @@ class portfolio_add_button {
                 $formoutput .= "\n" . '</form>';
             break;
             case PORTFOLIO_ADD_ICON_LINK:
-                $linkoutput .= '"><img src="' . $OUTPUT->pix_url('t/portfolio') . '" alt=' . $addstr .'" /></a>';
+                $linkoutput .= '"><img src="' . $OUTPUT->pix_url('t/portfolio') . '" alt="' . $addstr .'" /></a>';
             break;
             case PORTFOLIO_ADD_TEXT_LINK:
                 $linkoutput .= '">' . $addstr .'</a>';