diff --git a/src/XMLSecurityDSig.php b/src/XMLSecurityDSig.php
index 16713ab..5f9aa5b 100644
--- a/src/XMLSecurityDSig.php
+++ b/src/XMLSecurityDSig.php
@@ -853,6 +853,7 @@ public function sign($objKey, $appendToNode = null)
                 $sMethod = $nodeset->item(0);
                 $sMethod->setAttribute('Algorithm', $objKey->type);
                 $data = $this->canonicalizeData($sInfo, $this->canonicalMethod);
+                $data = preg_replace("/>\s+</", "><", $data); // remove whitespaces between elements
                 $sigValue = base64_encode($this->signData($objKey, $data));
                 $sigValueNode = $this->createNewSignNode('SignatureValue', $sigValue);
                 if ($infoSibling = $sInfo->nextSibling) {