diff --git a/src/AIModel/AIManager.cxx b/src/AIModel/AIManager.cxx
index 88d4c04aa..4b128e1c1 100644
--- a/src/AIModel/AIManager.cxx
+++ b/src/AIModel/AIManager.cxx
@@ -63,6 +63,7 @@ FGAIManager::~FGAIManager() {
   while (i != loadedModels.end())
     {
       i->getModelId()->deRef();
+      ++i;
     }
 }