diff --git a/github/AuthenticatedUser.py b/github/AuthenticatedUser.py
index 9f9993d5..19dfe4e4 100644
--- a/github/AuthenticatedUser.py
+++ b/github/AuthenticatedUser.py
@@ -973,9 +973,11 @@ class AuthenticatedUser(github.GithubObject.CompletableGithubObject):
 
         params = dict()
         if all is not github.GithubObject.NotSet:
-            params["all"] = all
+            # convert True, False to true, false for api parameters
+            params["all"] = "true" if all else "false"
         if participating is not github.GithubObject.NotSet:
-            params["participating"] = participating
+            # convert True, False to true, false for api parameters
+            params["participating"] = "true" if participating else "false"
         if since is not github.GithubObject.NotSet:
             params["since"] = since.strftime("%Y-%m-%dT%H:%M:%SZ")
         if before is not github.GithubObject.NotSet: