diff --git a/lib/sha1_test.c b/lib/sha1_test.c
index 802ba7b6..b239287b 100644
--- a/lib/sha1_test.c
+++ b/lib/sha1_test.c
@@ -206,6 +206,23 @@ t_sha1_hmac(void)
 	  },
 	  .out = "e8e99d0f45237d786d6bbaa7965c7808bbff1a91",
       },
+      {
+	  .in  = {
+	      .key = {
+		  0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61,
+		  0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61,
+		  0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61,
+		  0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61,
+		  0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61,
+		  0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61, 0x61,
+		  0x61, 0x61, 0x61, 0x61,
+	      },
+	      .key_len = 64,
+	      .data = "Test Using key 64 bytes sized",
+	      .data_len = 29,
+	  },
+	  .out = "a55d4fb80962a6b3d2e720705314bee417d68cf6",
+      },
   };
 
   bt_assert_fn_in_out(get_sha1_hmac, in_out, NULL, "'%s'");