diff --git a/test/book/specialized/kuehne-schroeter-matroids/realization_space.jlcon b/test/book/specialized/kuehne-schroeter-matroids/realization_space.jlcon
index b6b82ceba9fa..5aff6d593ef4 100644
--- a/test/book/specialized/kuehne-schroeter-matroids/realization_space.jlcon
+++ b/test/book/specialized/kuehne-schroeter-matroids/realization_space.jlcon
@@ -124,3 +124,5 @@ One realization is given by
   [0   1   1   0   1   1   1   1   1]
   [0   0   0   1   2   3   6   3   2]
 in the rational field
+
+julia> results = collection = db = 0; # allow connection cleanup