diff --git a/src/apps/deskflow-core/deskflow-core.cpp b/src/apps/deskflow-core/deskflow-core.cpp
index 3ea5a8919..2171a6ae6 100644
--- a/src/apps/deskflow-core/deskflow-core.cpp
+++ b/src/apps/deskflow-core/deskflow-core.cpp
@@ -26,6 +26,32 @@
 #include <QSharedMemory>
 #include <QTextStream>
 #include <QThread>
+#include <QtGlobal>
+
+void qtMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &message)
+{
+  const auto utf8 = message.toUtf8();
+  switch (type) {
+  case QtDebugMsg:
+    CLOG->print(context.file, context.line, CLOG_TAG_DEBUG "%s", utf8.constData());
+    break;
+  case QtInfoMsg:
+    CLOG->print(context.file, context.line, CLOG_TAG_INFO "%s", utf8.constData());
+    break;
+  case QtWarningMsg:
+    CLOG->print(context.file, context.line, CLOG_TAG_WARN "%s", utf8.constData());
+    break;
+  case QtCriticalMsg:
+    CLOG->print(context.file, context.line, CLOG_TAG_ERR "%s", utf8.constData());
+    break;
+  case QtFatalMsg:
+    CLOG->print(context.file, context.line, CLOG_TAG_CRIT "%s", utf8.constData());
+    break;
+  }
+  if (type == QtFatalMsg) {
+    abort();
+  }
+}
 
 void showHelp(const CoreArgParser &parser)
 {
@@ -57,6 +83,7 @@ int main(int argc, char **argv)
   arch.init();
 
   Log log;
+  qInstallMessageHandler(qtMessageHandler);
 
   QStringList args;
   for (int i = 0; i < argc; i++)
diff --git a/src/lib/base/Log.h b/src/lib/base/Log.h
index 2697bc8f6..df6c15d84 100644
--- a/src/lib/base/Log.h
+++ b/src/lib/base/Log.h
@@ -199,15 +199,27 @@ otherwise it expands to a call that doesn't.
 // end, then we resort to using non-numerical chars. this still works (since
 // to deduce the number we subtract octal \060, so '/' is -1, and ':' is 10
 
-#define CLOG_PRINT CLOG_TRACE "%z\057" // char is '/'
-#define CLOG_CRIT CLOG_TRACE "%z\060"  // char is '0'
-#define CLOG_ERR CLOG_TRACE "%z\061"
-#define CLOG_WARN CLOG_TRACE "%z\062"
-#define CLOG_NOTE CLOG_TRACE "%z\063"
-#define CLOG_INFO CLOG_TRACE "%z\064"
-#define CLOG_DEBUG CLOG_TRACE "%z\065"
-#define CLOG_DEBUG1 CLOG_TRACE "%z\066"
-#define CLOG_DEBUG2 CLOG_TRACE "%z\067"
+// Priority tag used as the first three bytes of a format string. Log::print
+// reads fmt[2] - '0' to recover the level, so the escape must be ASCII '0'-'9'.
+#define CLOG_TAG_PRINT "%z\057" // char is '/'
+#define CLOG_TAG_CRIT "%z\060"  // char is '0'
+#define CLOG_TAG_ERR "%z\061"
+#define CLOG_TAG_WARN "%z\062"
+#define CLOG_TAG_NOTE "%z\063"
+#define CLOG_TAG_INFO "%z\064"
+#define CLOG_TAG_DEBUG "%z\065"
+#define CLOG_TAG_DEBUG1 "%z\066"
+#define CLOG_TAG_DEBUG2 "%z\067"
+
+#define CLOG_PRINT CLOG_TRACE CLOG_TAG_PRINT
+#define CLOG_CRIT CLOG_TRACE CLOG_TAG_CRIT
+#define CLOG_ERR CLOG_TRACE CLOG_TAG_ERR
+#define CLOG_WARN CLOG_TRACE CLOG_TAG_WARN
+#define CLOG_NOTE CLOG_TRACE CLOG_TAG_NOTE
+#define CLOG_INFO CLOG_TRACE CLOG_TAG_INFO
+#define CLOG_DEBUG CLOG_TRACE CLOG_TAG_DEBUG
+#define CLOG_DEBUG1 CLOG_TRACE CLOG_TAG_DEBUG1
+#define CLOG_DEBUG2 CLOG_TRACE CLOG_TAG_DEBUG2
 
 #define LOG_PRINT(...) LOG((CLOG_PRINT __VA_ARGS__))
 #define LOG_CRIT(...) LOG((CLOG_CRIT __VA_ARGS__))