diff --git a/jetty-openid/src/test/java/org/eclipse/jetty/security/openid/JwtDecoderTest.java b/jetty-openid/src/test/java/org/eclipse/jetty/security/openid/JwtDecoderTest.java
index a87a64b1e4f1..01ea028010ea 100644
--- a/jetty-openid/src/test/java/org/eclipse/jetty/security/openid/JwtDecoderTest.java
+++ b/jetty-openid/src/test/java/org/eclipse/jetty/security/openid/JwtDecoderTest.java
@@ -96,4 +96,27 @@ public void testEncodeDecode()
         assertThat(decodedClaims.get("name"), is(name));
         assertThat(decodedClaims.get("exp"), is(expiry));
     }
+
+    @Test
+    public void testDecodeMissingPadding()
+    {
+        // Example given in Issue #4128 which requires the re-adding the B64 padding to decode.
+        String jwt = "eyJraWQiOiIxNTU1OTM0ODQ3IiwieDV0IjoiOWdCOW9zRldSRHRSMkhtNGNmVnJnWTBGcmZRIiwiYWxnIjoiUlMyNTYifQ"
+            + ".eyJhdF9oYXNoIjoiQTA0NUoxcE5YRk1nYzlXN2wxSk1fUSIsImRlbGVnYXRpb25faWQiOiJjZTBhNjRlNS0xYWY3LTQ2MzEtOGUz"
+            + "NC1mNDE5N2JkYzVjZTAiLCJhY3IiOiJ1cm46c2U6Y3VyaXR5OmF1dGhlbnRpY2F0aW9uOmh0bWwtZm9ybTpodG1sLXByaW1hcnkiL"
+            + "CJzX2hhc2giOiIwc1FtRG9YY3FwcnM4NWUzdy0wbHdBIiwiYXpwIjoiNzZiZTc5Y2ItM2E1Ni00ZTE3LTg3NzYtNDI1Nzc5MjRjYz"
+            + "c2IiwiYXV0aF90aW1lIjoxNTY5NjU4MDk1LCJleHAiOjE1Njk2NjE5OTUsIm5iZiI6MTU2OTY1ODM5NSwianRpIjoiZjJkNWI2YzE"
+            + "tNTIxYi00Y2Y5LThlNWEtOTg5NGJhNmE0MzkyIiwiaXNzIjoiaHR0cHM6Ly9ub3JkaWNhcGlzLmN1cml0eS5pby9-IiwiYXVkIjoi"
+            + "NzZiZTc5Y2ItM2E1Ni00ZTE3LTg3NzYtNDI1Nzc5MjRjYzc2Iiwic3ViIjoibmlrb3MiLCJpYXQiOjE1Njk2NTgzOTUsInB1cnBvc"
+            + "2UiOiJpZCJ9.Wd458zNmXggpkDN6vbS3-aiajh4-VbkmcStLYUqahYJUp9p-AUI_RZttWvwh3UDMG9rWww_ya8KFK_SkPfKooEaSN"
+            + "OjOhw0ox4d-9lgti3J49eRyO20RViXvRHyLVtcjv5IaqvMXgwW60Thubv19OION7DstyArffcxNNSpiqDq6wjd0T2DJ3gSXXlJHLT"
+            + "Wrry3svqu1j_GCbHc04XYGicxsusKgc3n22dh4I6p4trdo0Gu5Un0bZ8Yov7IzWItqTgm9X5r9gZlAOLcAuK1WTwkzAwZJ24HgvxK"
+            + "muYfV_4ZCg_VPN2Op8YPuRAQOgUERpeTv1RDFTOG9GKZIMBVR0A";
+
+        // Decode the ID Token and verify the claims are the correct.
+        Map<String, Object> decodedClaims = JwtDecoder.decode(jwt);
+        assertThat(decodedClaims.get("sub"), is("nikos"));
+        assertThat(decodedClaims.get("aud"), is("76be79cb-3a56-4e17-8776-42577924cc76"));
+        assertThat(decodedClaims.get("exp"), is(1569661995L));
+    }
 }
\ No newline at end of file