diff --git a/testssl.sh b/testssl.sh
index 29e3f2d..81f9677 100755
--- a/testssl.sh
+++ b/testssl.sh
@@ -1457,7 +1457,7 @@ run_http_header() {
 detect_ipv4() {
      local octet="(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])"
      local ipv4address="$octet\\.$octet\\.$octet\\.$octet"
-     local whitelisted_header="pagespeed|page-speed|^Content-Security-Policy|^MicrosoftSharePointTeamServices|^X-OWA-Version"
+     local whitelisted_header="pagespeed|page-speed|^Content-Security-Policy|^MicrosoftSharePointTeamServices|^X-OWA-Version|^Location|^Server: PRTG"
      local your_ip_msg="(check if it's your IP address or e.g. a cluster IP)"
      local result
      local first=true