diff --git a/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/properties/AnnotationsPropertySource.java b/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/properties/AnnotationsPropertySource.java
index 02f6f905e85..cc9e8ac7a23 100644
--- a/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/properties/AnnotationsPropertySource.java
+++ b/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/properties/AnnotationsPropertySource.java
@@ -116,7 +116,6 @@ public class AnnotationsPropertySource extends EnumerablePropertySource<Class<?>
 	}
 
 	private String dotAppend(String prefix, String postfix) {
-		prefix = (prefix == null ? "" : prefix);
 		if (StringUtils.hasText(prefix)) {
 			return (prefix.endsWith(".") ? prefix + postfix : prefix + "." + postfix);
 		}