diff --git a/pytest_mergify/resources/github_actions.py b/pytest_mergify/resources/github_actions.py
index f505bc0..90e62f8 100644
--- a/pytest_mergify/resources/github_actions.py
+++ b/pytest_mergify/resources/github_actions.py
@@ -30,7 +30,7 @@ def detect(self) -> Resource:
 
         if "GITHUB_SERVER_URL" in os.environ and "GITHUB_REPOSITORY" in os.environ:
             attributes[vcs_attributes.VCS_REPOSITORY_URL_FULL] = (
-                os.environ["GITHUB_SERVER_URL"] + os.environ["GITHUB_REPOSITORY"]
+                os.environ["GITHUB_SERVER_URL"] + "/" + os.environ["GITHUB_REPOSITORY"]
             )
 
         for attribute_name, envvar in self.OPENTELEMETRY_GHA_MAPPING.items():
diff --git a/tests/test_resources.py b/tests/test_resources.py
index 98a77bb..87fab29 100644
--- a/tests/test_resources.py
+++ b/tests/test_resources.py
@@ -39,8 +39,13 @@ def test_span_github_actions(
     # Do a partial reconfig, half GHA, half local to have spans
     monkeypatch.setenv("GITHUB_ACTIONS", "true")
     monkeypatch.setenv("GITHUB_REPOSITORY", "Mergifyio/pytest-mergify")
+    monkeypatch.setenv("GITHUB_SERVER_URL", "https://github.com")
     result, spans = pytester_with_spans()
     assert all(
         span.resource.attributes["vcs.repository.name"] == "Mergifyio/pytest-mergify"
         for span in spans.values()
     )
+    assert all(
+        span.resource.attributes["vcs.repository.url.full"] == "https://github.com/Mergifyio/pytest-mergify"
+        for span in spans.values()
+    )