diff --git a/src/plugins/nightlight/nightlightmanager.cpp b/src/plugins/nightlight/nightlightmanager.cpp
index f92b615a95..b94dc99316 100644
--- a/src/plugins/nightlight/nightlightmanager.cpp
+++ b/src/plugins/nightlight/nightlightmanager.cpp
@@ -279,8 +279,12 @@ void NightLightManager::readConfig()
     // fixed timings
     QTime mrB = QTime::fromString(s->morningBeginFixed(), "hhmm");
     QTime evB = QTime::fromString(s->eveningBeginFixed(), "hhmm");
+    if (mrB >= evB) {
+        mrB = QTime(6, 0);
+        evB = QTime(18, 0);
+    }
 
-    int diffME = evB > mrB ? mrB.msecsTo(evB) : evB.msecsTo(mrB);
+    int diffME = mrB.msecsTo(evB);
     int diffMin = std::min(diffME, MSC_DAY - diffME);
 
     int trTime = s->transitionTime() * 1000 * 60;