diff --git a/interface/lib/classes/simplepie.inc.php b/interface/lib/classes/simplepie.inc.php
index 6ddc0e089d2575ec85c9e8fe8d5c4416c3b0464f..5f56465bd9a90c0565459d1d35f2b2c15c23366f 100644
--- a/interface/lib/classes/simplepie.inc.php
+++ b/interface/lib/classes/simplepie.inc.php
@@ -12151,7 +12151,7 @@ class SimplePie_IRI
 		}
 		else
 		{
-			$this->query = $this->replace_invalid_with_pct_encoding($query, 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~!$\'()*+,;:@/?');
+			$this->query = $this->replace_invalid_with_pct_encoding($query, 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~!$\'()*+,;:@/?&=');
 		}
 		$this->valid[__FUNCTION__] = true;
 		return true;