diff --git a/modules/collect/src/main/java/com/opengamma/strata/collect/Guavate.java b/modules/collect/src/main/java/com/opengamma/strata/collect/Guavate.java
index 95bf48d9ee..cf18c1f704 100644
--- a/modules/collect/src/main/java/com/opengamma/strata/collect/Guavate.java
+++ b/modules/collect/src/main/java/com/opengamma/strata/collect/Guavate.java
@@ -829,7 +829,7 @@ static class OnlyCollector<T> implements Collector<T, OnlyCollector<T>, Optional
 
     @Override
     public Supplier<OnlyCollector<T>> supplier() {
-      return () -> this;
+      return OnlyCollector::new;
     }
 
     @Override