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-rw-r--r--src/group_cmd.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/group_cmd.cpp b/src/group_cmd.cpp
index cc07395e2..bd4905268 100644
--- a/src/group_cmd.cpp
+++ b/src/group_cmd.cpp
@@ -368,7 +368,7 @@ void SetTrainGroupID(Train *v, GroupID new_g)
*/
void UpdateTrainGroupID(Train *v)
{
- assert(v->IsFrontEngine() || IsFreeWagon(v));
+ assert(v->IsFrontEngine() || v->IsFreeWagon());
GroupID new_g = v->IsFrontEngine() ? v->group_id : (GroupID)DEFAULT_GROUP;
for (Vehicle *u = v; u != NULL; u = u->Next()) {