diff --git a/tests/unit_tests/crypto.cpp b/tests/unit_tests/crypto.cpp
index 7f926534a..9b9cc60a2 100644
--- a/tests/unit_tests/crypto.cpp
+++ b/tests/unit_tests/crypto.cpp
@@ -105,6 +105,7 @@ TEST(Crypto, tree_branch)
 {
   crypto::hash inputs[6];
   crypto::hash branch[8];
+  crypto::hash branch_1[8 + 1];
   crypto::hash root, root2;
   size_t depth;
   uint32_t path, path2;
@@ -289,12 +290,16 @@ TEST(Crypto, tree_branch)
   ASSERT_FALSE(crypto::is_branch_in_tree(inputs[5].data, root.data, (const char(*)[32])branch, depth, path));
   ASSERT_FALSE(crypto::is_branch_in_tree(crypto::null_hash.data, root.data, (const char(*)[32])branch, depth, path));
 
+  // a version with an extra (dummy) hash
+  memcpy(branch_1, branch, sizeof(branch));
+  branch_1[depth] = crypto::null_hash;
+
   ASSERT_FALSE(crypto::is_branch_in_tree(inputs[4].data, root.data, (const char(*)[32])branch, depth - 1, path));
-  ASSERT_FALSE(crypto::is_branch_in_tree(inputs[4].data, root.data, (const char(*)[32])branch, depth + 1, path));
+  ASSERT_FALSE(crypto::is_branch_in_tree(inputs[4].data, root.data, (const char(*)[32])branch_1, depth + 1, path));
   ASSERT_FALSE(crypto::is_branch_in_tree(inputs[4].data, root.data, (const char(*)[32])branch, depth, path ^ 1));
   ASSERT_FALSE(crypto::is_branch_in_tree(inputs[4].data, root.data, (const char(*)[32])branch, depth, path ^ 2));
   ASSERT_FALSE(crypto::is_branch_in_tree(inputs[4].data, root.data, (const char(*)[32])branch, depth, path ^ 3));
-  ASSERT_FALSE(crypto::is_branch_in_tree(inputs[4].data, root.data, (const char(*)[32])(branch + 1), depth, path));
+  ASSERT_FALSE(crypto::is_branch_in_tree(inputs[4].data, root.data, (const char(*)[32])(branch_1 + 1), depth, path));
 
   // five, not found
   ASSERT_FALSE(crypto::tree_branch((const char(*)[32])inputs, 5, crypto::null_hash.data, (char(*)[32])branch, &depth, &path));