diff --git a/src/test/java/org/apache/commons/lang3/builder/ToStringBuilderTest.java b/src/test/java/org/apache/commons/lang3/builder/ToStringBuilderTest.java
index 31010715c..c55fe2f19 100644
--- a/src/test/java/org/apache/commons/lang3/builder/ToStringBuilderTest.java
+++ b/src/test/java/org/apache/commons/lang3/builder/ToStringBuilderTest.java
@@ -1041,7 +1041,7 @@ class InheritedReflectionStaticFieldsFixture extends SimpleReflectionStaticField
         static final int staticInt2 = 67890;
     }
 
-    @Test
+    @Test(expected=IllegalArgumentException.class)
     public void testReflectionNull() {
         assertEquals("<null>", ReflectionToStringBuilder.toString(null));
     }