diff --git a/buildbot_nix/__init__.py b/buildbot_nix/__init__.py
index c1f6a27..54fc72d 100644
--- a/buildbot_nix/__init__.py
+++ b/buildbot_nix/__init__.py
@@ -25,6 +25,7 @@ from .github_projects import (  # noqa: E402
     create_project_hook,
     load_projects,
     refresh_projects,
+    slugify_project_name
 )
 from twisted.internet import defer, threads
 from twisted.python.failure import Failure
@@ -63,7 +64,7 @@ class BuildTrigger(Trigger):
             "github.base.repo.full_name",
             build_props.getProperty("github.repository.full_name"),
         )
-        project_id = repo_name.replace("/", "-")
+        project_id = slugify_project_name(repo_name)
         source = f"nix-eval-{project_id}"
 
         sch = self.schedulerNames[0]
@@ -151,7 +152,7 @@ class NixEvalCommand(buildstep.ShellMixin, steps.BuildStep):
                 "github.base.repo.full_name",
                 build_props.getProperty("github.repository.full_name"),
             )
-            project_id = repo_name.replace("/", "-")
+            project_id = slugify_project_name(repo_name)
             scheduler = f"{project_id}-nix-build"
             filtered_jobs = []
             for job in jobs:
diff --git a/buildbot_nix/github_projects.py b/buildbot_nix/github_projects.py
index 6dfa335..ddfc0bd 100644
--- a/buildbot_nix/github_projects.py
+++ b/buildbot_nix/github_projects.py
@@ -69,6 +69,10 @@ def paginated_github_request(url: str, token: str) -> list[dict[str, Any]]:
     return items
 
 
+def slugify_project_name(name: str) -> str:
+    return name.replace(".", "-").replace("/", "-")
+
+
 class GithubProject:
     def __init__(self, data: dict[str, Any]) -> None:
         self.data = data
@@ -91,8 +95,7 @@ class GithubProject:
 
     @property
     def id(self) -> str:
-        n = self.data["full_name"]
-        return n.replace("/", "-")
+        return slugify_project_name(self.data["full_name"])
 
     @property
     def default_branch(self) -> str: