diff --git a/github/Requester.py b/github/Requester.py
index 480186a990..bade682567 100644
--- a/github/Requester.py
+++ b/github/Requester.py
@@ -629,17 +629,18 @@ def __log(self, verb, url, requestHeaders, input, status, responseHeaders, outpu
         if self.__logger is None:
             self.__logger = logging.getLogger(__name__)
         if self.__logger.isEnabledFor(logging.DEBUG):
+            headersForRequest = requestHeaders.copy()
             if "Authorization" in requestHeaders:
                 if requestHeaders["Authorization"].startswith("Basic"):
-                    requestHeaders[
+                    headersForRequest[
                         "Authorization"
                     ] = "Basic (login and password removed)"
                 elif requestHeaders["Authorization"].startswith("token"):
-                    requestHeaders["Authorization"] = "token (oauth token removed)"
+                    headersForRequest["Authorization"] = "token (oauth token removed)"
                 elif requestHeaders["Authorization"].startswith("Bearer"):
-                    requestHeaders["Authorization"] = "Bearer (jwt removed)"
+                    headersForRequest["Authorization"] = "Bearer (jwt removed)"
                 else:  # pragma no cover (Cannot happen, but could if we add an authentication method => be prepared)
-                    requestHeaders[
+                    headersForRequest[
                         "Authorization"
                     ] = "(unknown auth removed)"  # pragma no cover (Cannot happen, but could if we add an authentication method => be prepared)
             self.__logger.debug(
@@ -648,7 +649,7 @@ def __log(self, verb, url, requestHeaders, input, status, responseHeaders, outpu
                 self.__scheme,
                 self.__hostname,
                 url,
-                requestHeaders,
+                headersForRequest,
                 input,
                 status,
                 responseHeaders,
diff --git a/tests/Logging_.py b/tests/Logging_.py
index 3f277f618e..d8e4a519d3 100644
--- a/tests/Logging_.py
+++ b/tests/Logging_.py
@@ -198,3 +198,19 @@ def testLoggingWithBaseUrl(self):
         }
         output = '{"type":"User","html_url":"https://github.com/jacquev6","login":"jacquev6","followers":14,"company":"Criteo","created_at":"2010-07-09T06:10:06Z","email":"vincent@vincent-jacques.net","hireable":false,"avatar_url":"https://secure.gravatar.com/avatar/b68de5ae38616c296fa345d2b9df2225?d=https://a248.e.akamai.net/assets.github.com%2Fimages%2Fgravatars%2Fgravatar-user-420.png","public_gists":3,"bio":"","following":29,"name":"Vincent Jacques","blog":"http://vincent-jacques.net","gravatar_id":"b68de5ae38616c296fa345d2b9df2225","id":327146,"public_repos":13,"location":"Paris, France","url":"https://api.github.com/users/jacquev6"}'
         self.assertLogging("GET", url, requestHeaders, responseHeaders, output)
+
+    def testLoggingDoesNotModifyRequestHeaders(self):
+        # Recorded replay data already sanitizes Authorization headers, so we
+        # need to go under the covers
+        requestHeaders = {"Authorization": "thisisnotatoken"}
+        responseHeaders = {"status": "200 OK"}
+        github.Github()._Github__requester._Requester__log(
+            "GET",
+            "http://example.com",
+            requestHeaders,
+            None,
+            200,
+            responseHeaders,
+            None,
+        )
+        self.assertEqual(requestHeaders["Authorization"], "thisisnotatoken")