diff --git a/README.md b/README.md
index 691af12..65c5692 100644
--- a/README.md
+++ b/README.md
@@ -34,8 +34,6 @@ is parsed into compiled C++ objects which are then used during validation. There
 still optimizations to be done, but validation speed has improved by factor 100
 or more.
 
-In JSON-schema one sub-schema can be
-
 # Design goals
 
 The main goal of this validator is to produce *human-comprehensible* error
@@ -44,7 +42,7 @@ messages if a JSON-document/instance does not comply to its schema.
 By default this is done with exceptions thrown at the users with a helpful
 message telling what's wrong with the document while validating.
 
-With **2.0.0** the user can passed a `json_scheam::basic_error_handler` derived object
+With **2.0.0** the user can pass a `json_scheam::basic_error_handler` derived object
 along with the instance to validate to receive a each time a validation error occurs
 and decice what to do (throwing, counting, collecting).
 
diff --git a/src/json-schema.hpp b/src/json-schema.hpp
index 853282a..22c15f1 100644
--- a/src/json-schema.hpp
+++ b/src/json-schema.hpp
@@ -92,7 +92,12 @@ public:
 	json_uri append(const std::string &field) const
 	{
 		json_uri u = *this;
+#if NLOHMANN_JSON_VERSION_MAJOR >= 3 && NLOHMANN_JSON_VERSION_MINOR >= 5 && NLOHMANN_JSON_VERSION_PATCH >= 1
+		u.pointer_.push_back(field);
+#else
 		u.pointer_ = nlohmann::json::json_pointer(u.pointer_.to_string() + '/' + escape(field));
+#endif
+
 		return u;
 	}
 
diff --git a/src/json-validator.cpp b/src/json-validator.cpp
index 96a439d..4ca00d8 100644
--- a/src/json-validator.cpp
+++ b/src/json-validator.cpp
@@ -1023,7 +1023,7 @@ std::shared_ptr<schema> schema::make(json &schema,
 	// append to all URIs the keys for this sub-schema
 	for (auto &key : keys)
 		for (auto &uri : uris)
-			uri = uri.append(json_uri::escape(key));
+			uri = uri.append(key);
 
 	std::shared_ptr<::schema> sch;