diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/invoke/convert/ConversionServiceParameterValueMapperTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/invoke/convert/ConversionServiceParameterValueMapperTests.java
index aea9ea17fc..e86da8a957 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/invoke/convert/ConversionServiceParameterValueMapperTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/invoke/convert/ConversionServiceParameterValueMapperTests.java
@@ -114,8 +114,8 @@ public class ConversionServiceParameterValueMapperTests {
 		}
 
 		@Override
-		public boolean isNullable() {
-			return true;
+		public boolean isMandatory() {
+			return false;
 		}
 
 	}