diff --git a/connect/runtime/src/test/java/org/apache/kafka/connect/runtime/rest/InternalRequestSignatureTest.java b/connect/runtime/src/test/java/org/apache/kafka/connect/runtime/rest/InternalRequestSignatureTest.java
index 82fab1313067..51c6dc3842a2 100644
--- a/connect/runtime/src/test/java/org/apache/kafka/connect/runtime/rest/InternalRequestSignatureTest.java
+++ b/connect/runtime/src/test/java/org/apache/kafka/connect/runtime/rest/InternalRequestSignatureTest.java
@@ -121,6 +121,8 @@ public void addToRequestShouldAddHeadersOnValidSignatureAlgorithm() {
                 signatureAlgorithmCapture.capture()
             )).thenReturn(request);
 
+        when(request.getAgent()).thenThrow(new RuntimeException());
+
         InternalRequestSignature.addToRequest(crypto, KEY, REQUEST_BODY, SIGNATURE_ALGORITHM, request);
 
         assertEquals(