diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 3811569c0..541ed81cc 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -94,6 +94,20 @@ BOOST_AUTO_TEST_CASE(util_HexStr)
         HexStr(ParseHex_expected, ParseHex_expected + 5, true),
         "04 67 8a fd b0");
 
+    BOOST_CHECK_EQUAL(
+        HexStr(ParseHex_expected + sizeof(ParseHex_expected),
+               ParseHex_expected + sizeof(ParseHex_expected)),
+        "");
+
+    BOOST_CHECK_EQUAL(
+        HexStr(ParseHex_expected + sizeof(ParseHex_expected),
+               ParseHex_expected + sizeof(ParseHex_expected), true),
+        "");
+
+    BOOST_CHECK_EQUAL(
+        HexStr(ParseHex_expected, ParseHex_expected),
+        "");
+
     BOOST_CHECK_EQUAL(
         HexStr(ParseHex_expected, ParseHex_expected, true),
         "");