diff --git a/src/blackmisc/aviation/altitude.cpp b/src/blackmisc/aviation/altitude.cpp
index e847eb26e..6e730fd62 100644
--- a/src/blackmisc/aviation/altitude.cpp
+++ b/src/blackmisc/aviation/altitude.cpp
@@ -342,8 +342,7 @@ namespace BlackMisc
                     }
                     if (!CMathUtils::epsilonZero(fmod(flInt, 5)))
                     {
-                        if (msgs) { msgs->push_back(CStatusMessage(this).validationError(u"FL needs to end with 0 or 5")); }
-                        return false;
+                        if (msgs) { msgs->push_back(CStatusMessage(this).validationWarning(u"FL should end with 0 or 5")); }
                     }
                 }
             }
diff --git a/tests/blackmisc/aviation/testflightplan/testflightplan.cpp b/tests/blackmisc/aviation/testflightplan/testflightplan.cpp
index fbb082efb..4b5c0c28c 100644
--- a/tests/blackmisc/aviation/testflightplan/testflightplan.cpp
+++ b/tests/blackmisc/aviation/testflightplan/testflightplan.cpp
@@ -72,6 +72,8 @@ namespace BlackMiscTest
         CAltitude a;
         a.parseFromFpAltitudeString("FL125");
         QVERIFY2(a == CAltitude(12500, CAltitude::FlightLevel, CLengthUnit::ft()), "Wrong altitude FL125");
+        a.parseFromFpAltitudeString("FL126");
+        QVERIFY2(a == CAltitude(12600, CAltitude::FlightLevel, CLengthUnit::ft()), "Wrong altitude FL126");
         a.parseFromFpAltitudeString("A122");
         QVERIFY2(a == CAltitude(12200, CAltitude::MeanSeaLevel, CLengthUnit::ft()), "Wrong altitude A122");
         a.parseFromFpAltitudeString("123ft");
@@ -87,8 +89,6 @@ namespace BlackMiscTest
         CAltitude faulty(a);
         faulty.makeNegative();
         QVERIFY2(!faulty.isValidFpAltitude(), "Negative values not allowed");
-        faulty.parseFromFpAltitudeString("FL111");
-        QVERIFY2(!faulty.isValidFpAltitude(), "FL should end with 0/5");
 
         // as string
         a = CAltitude(12500, CAltitude::FlightLevel, CLengthUnit::ft());