diff --git a/kstars/auxiliary/ksutils.cpp b/kstars/auxiliary/ksutils.cpp
index 57fc6a6788e4e8f12aeee27aac4bfd3a43b2ee20..fc0a65d10de2f20b9f6dbfa6d2075b4b7671ab5b 100644
--- a/kstars/auxiliary/ksutils.cpp
+++ b/kstars/auxiliary/ksutils.cpp
@@ -565,7 +565,7 @@ void Logging::UseFile()
         QDir dir;
         QString path = KSPaths::writableLocation(QStandardPaths::GenericDataLocation) + "logs/" + QDateTime::currentDateTime().toString("yyyy-MM-dd");
         dir.mkpath(path);
-        QString name = "log_" + QDateTime::currentDateTime().toString("HH:mm:ss") + ".txt";
+        QString name = "log_" + QDateTime::currentDateTime().toString("HH-mm-ss") + ".txt";
         _filename = path + QStringLiteral("/") + name;
 
         // Clear file contents
diff --git a/kstars/indi/indistd.cpp b/kstars/indi/indistd.cpp
index 486d8f1ad671659405410fbd6c7636cb924a4bf3..ca110ebe2f92ff31563396dd3dc56a9baec16e6b 100644
--- a/kstars/indi/indistd.cpp
+++ b/kstars/indi/indistd.cpp
@@ -311,7 +311,7 @@ void GenericDevice::processBLOB(IBLOB * bp)
 
     QString filename(currentDir + '/');
 
-    QString ts = QDateTime::currentDateTime().toString("yyyy-MM-ddThh:mm:ss");
+    QString ts = QDateTime::currentDateTime().toString("yyyy-MM-ddThh-mm-ss");
 
     filename += QString("file_") + ts +  QString(bp->format).trimmed();