diff --git a/src/Airports/dynamics.cxx b/src/Airports/dynamics.cxx
index c42635f4a..293d2ff6a 100644
--- a/src/Airports/dynamics.cxx
+++ b/src/Airports/dynamics.cxx
@@ -508,7 +508,7 @@ int FGAirportDynamics::getGroundFrequency(unsigned leg)
 
     if ((freqGround.size() < leg) && (leg > 0)) {
         groundFreq =
-            (freqGround.size() <
+            (freqGround.size() <=
              (leg - 1)) ? freqGround[freqGround.size() -
                                      1] : freqGround[leg - 1];
     }