diff --git a/index.ts b/index.ts
index b0ca0c9..d3acf3e 100644
--- a/index.ts
+++ b/index.ts
@@ -416,10 +416,11 @@ function useEnvModel() {
 
 function useEnvRunUrl() {
   const context = useContext()
-  const runId = process.env["GITHUB_RUN_ID"]
-  if (!runId) throw new Error(`Environment variable "GITHUB_RUN_ID" is not set`)
+  const runNumber = process.env["GITHUB_RUN_NUMBER"] || process.env["GITHUB_RUN_ID"]
+  if (!runNumber) throw new Error(`Environment variable "GITHUB_RUN_NUMBER" is not set`)
 
-  return `/${context.repo.owner}/${context.repo.repo}/actions/runs/${runId}`
+  const serverUrl = (process.env["GITHUB_SERVER_URL"] || "https://github.com").replace(/\/+$/, "")
+  return `${serverUrl}/${context.repo.owner}/${context.repo.repo}/actions/runs/${runNumber}`
 }
 
 function useEnvAgent() {