1 files changed, 2 insertions, 2 deletions
diff --git a/src/main/java/au/id/zancanaro/javacheck/junit/Properties.java b/src/main/java/au/id/zancanaro/javacheck/junit/Properties.java
index b0dd2cd..6bba786 100644
--- a/src/main/java/au/id/zancanaro/javacheck/junit/Properties.java
+++ b/src/main/java/au/id/zancanaro/javacheck/junit/Properties.java
@@ -229,8 +229,8 @@ public class Properties extends BlockJUnit4ClassRunner {
             Thread shutdownHandler = makeShutdownHandler(smallest, originalEx);
             Runtime.getRuntime().addShutdownHook(shutdownHandler);
 
-            Iterator<ShrinkTree<List<Object>>> trees = failed.getChildren();
             Set<List<Object>> seenArgs = new HashSet<>();
+            Iterator<ShrinkTree<List<Object>>> trees = failed.getChildren().iterator();
             while (trees.hasNext()) {
                 ShrinkTree<List<Object>> tree = trees.next();
                 if (seenArgs.add(Arrays.asList(tree.getValue()))) {
@@ -240,7 +240,7 @@ public class Properties extends BlockJUnit4ClassRunner {
                         // ignore, because it's not useful
                     } catch (Throwable ex) {
                         smallest[0] = new ShrinkResult(tree.getValue(), ex);
-                        Iterator<ShrinkTree<List<Object>>> children = tree.getChildren();
+                        Iterator<ShrinkTree<List<Object>>> children = tree.getChildren().iterator();
                         if (children.hasNext()) {
                             trees = children;
                         } else {