diff --git a/spring-cloud-sleuth-autoconfigure/src/main/java/org/springframework/cloud/sleuth/autoconfig/instrument/rsocket/TraceRSocketAutoConfiguration.java b/spring-cloud-sleuth-autoconfigure/src/main/java/org/springframework/cloud/sleuth/autoconfig/instrument/rsocket/TraceRSocketAutoConfiguration.java
index 85520486a..a1584823b 100644
--- a/spring-cloud-sleuth-autoconfigure/src/main/java/org/springframework/cloud/sleuth/autoconfig/instrument/rsocket/TraceRSocketAutoConfiguration.java
+++ b/spring-cloud-sleuth-autoconfigure/src/main/java/org/springframework/cloud/sleuth/autoconfig/instrument/rsocket/TraceRSocketAutoConfiguration.java
@@ -69,7 +69,7 @@ public class TraceRSocketAutoConfiguration {
 	}
 
 	private boolean containsZipkinPropagationType(List<String> types) {
-		return types.stream().anyMatch(s -> s.toLowerCase(Locale.ROOT).contains("b3"));
+		return types.stream().anyMatch(s -> s.equalsIgnoreCase("b3"));
 	}
 
 	@Bean