diff --git a/src/AIModel/AIShip.cxx b/src/AIModel/AIShip.cxx
index 9eecd6c97..9b6a04705 100644
--- a/src/AIModel/AIShip.cxx
+++ b/src/AIModel/AIShip.cxx
@@ -620,6 +620,10 @@ double FGAIShip::getCourse(double lat, double lon, double lat2, double lon2) con
 
 void FGAIShip::ProcessFlightPlan(double dt) {
 
+    if ( dt < 0.00001 ) {
+	return;
+    }
+
     double time_sec = getDaySeconds();
 
     _dt_count += dt;