diff --git a/src/QGC.h b/src/QGC.h
index f8ed9f123fd3b6e79574250a72115fc11752d9c9..5dfdd881add82475179d3035e8bd3d4fbd1922d0 100644
--- a/src/QGC.h
+++ b/src/QGC.h
@@ -8,7 +8,7 @@ namespace QGC
 {
     const QColor ColorCyan(55, 154, 195);
 
-    quint64 groundTimeUsecs()
+    static quint64 groundTimeUsecs()
     {
         QDateTime time = QDateTime::currentDateTime();
         time = time.toUTC();