diff --git a/src/androidTest/res/raw/gpx_timezone.gpx b/src/androidTest/res/raw/gpx_timezone.gpx
index a9946060f..b22f69154 100644
--- a/src/androidTest/res/raw/gpx_timezone.gpx
+++ b/src/androidTest/res/raw/gpx_timezone.gpx
@@ -10,7 +10,7 @@ xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v2"
 xmlns:gpxtrkx="http://www.garmin.com/xmlschemas/TrackStatsExtension/v1"
 xmlns:cluetrust="http://www.cluetrust.com/Schemas/"
 xmlns:pwr="http://www.garmin.com/xmlschemas/PowerExtension/v1"
-xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.topografix.com/GPX/Private/TopoGrafix/0/1 http://www.topografix.com/GPX/Private/TopoGrafix/0/1/topografix.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v2 https://www8.garmin.com/xmlschemas/TrackPointExtensionv2.xsd http://www.garmin.com/xmlschemas/PowerExtension/v1 https://www8.garmin.com/xmlschemas/PowerExtensionv1.xsd http://www.garmin.com/xmlschemas/TrackStatsExtension/v1 http://www.cluetrust.com/Schemas http://www.cluetrust.com/Schemas/gpxdata10.xsd http://opentracksapp.com/xmlschemas/v1 http://opentracksapp.com/xmlschemas/OpenTracks_v1.xsd">
+xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd http://www.topografix.com/GPX/Private/TopoGrafix/0/1 http://www.topografix.com/GPX/Private/TopoGrafix/0/1/topografix.xsd http://www.garmin.com/xmlschemas/TrackPointExtension/v2 https://www8.garmin.com/xmlschemas/TrackPointExtensionv2.xsd http://www.garmin.com/xmlschemas/PowerExtension/v1 https://www8.garmin.com/xmlschemas/PowerExtensionv1.xsd http://www.garmin.com/xmlschemas/TrackStatsExtension/v1 https://www.cluetrust.com/Schemas http://www.cluetrust.com/Schemas/gpxdata10.xsd http://opentracksapp.com/xmlschemas/v1 http://opentracksapp.com/xmlschemas/OpenTracks_v1.xsd">
 <wpt lat="3" lon="14">
 <ele>10</ele>
 <time>2021-01-07T21:51:59.179+01:15</time>
diff --git a/src/main/java/de/dennisguse/opentracks/io/file/exporter/GPXTrackExporter.java b/src/main/java/de/dennisguse/opentracks/io/file/exporter/GPXTrackExporter.java
index d3fccf19b..e2f0975f1 100644
--- a/src/main/java/de/dennisguse/opentracks/io/file/exporter/GPXTrackExporter.java
+++ b/src/main/java/de/dennisguse/opentracks/io/file/exporter/GPXTrackExporter.java
@@ -229,7 +229,7 @@ public class GPXTrackExporter implements TrackExporter {
                 + " http://www.garmin.com/xmlschemas/TrackPointExtension/v2 https://www8.garmin.com/xmlschemas/TrackPointExtensionv2.xsd"
                 + " http://www.garmin.com/xmlschemas/PowerExtension/v1 https://www8.garmin.com/xmlschemas/PowerExtensionv1.xsd"
                 + " http://www.garmin.com/xmlschemas/TrackStatsExtension/v1"
-                + " http://www.cluetrust.com/Schemas http://www.cluetrust.com/Schemas/gpxdata10.xsd"
+                + " http://www.cluetrust.com/Schemas https://www.cluetrust.com/Schemas/gpxdata10.xsd"
                 + " http://opentracksapp.com/xmlschemas/v1 http://opentracksapp.com/xmlschemas/OpenTracks_v1.xsd\">");
     }