diff --git a/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/util/ArrayListSpanAccumulator.java b/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/util/ArrayListSpanAccumulator.java
index 774313124..2a412d167 100644
--- a/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/util/ArrayListSpanAccumulator.java
+++ b/spring-cloud-sleuth-core/src/main/java/org/springframework/cloud/sleuth/util/ArrayListSpanAccumulator.java
@@ -34,7 +34,7 @@ public class ArrayListSpanAccumulator implements SpanReporter {
 
 	public List<Span> getSpans() {
 		synchronized (this.spans) {
-			return new ArrayList<>(this.spans);
+			return this.spans;
 		}
 	}
 
diff --git a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/integration/WebClientTests.java b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/integration/WebClientTests.java
index 347db6be4..14c7c8ba5 100644
--- a/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/integration/WebClientTests.java
+++ b/spring-cloud-sleuth-core/src/test/java/org/springframework/cloud/sleuth/instrument/web/client/integration/WebClientTests.java
@@ -113,7 +113,7 @@ public class WebClientTests {
 		then(getHeader(response, Span.TRACE_ID_NAME)).isNull();
 		then(getHeader(response, Span.SPAN_ID_NAME)).isNull();
 		then(this.listener.getSpans()).isNotEmpty();
-		Optional<Span> noTraceSpan = this.listener.getSpans().stream().filter(span ->
+		Optional<Span> noTraceSpan = new ArrayList<>(this.listener.getSpans()).stream().filter(span ->
 				"http:/notrace".equals(span.getName()) && !span.tags().isEmpty()).findFirst();
 		then(noTraceSpan.isPresent()).isTrue();
 		// TODO: matches cause there is an issue with Feign not providing the full URL at the interceptor level