diff --git a/packages/nodejs/.changesets/fix-diagnose-log_dir_path-path.md b/packages/nodejs/.changesets/fix-diagnose-log_dir_path-path.md
new file mode 100644
index 00000000..ea85598c
--- /dev/null
+++ b/packages/nodejs/.changesets/fix-diagnose-log_dir_path-path.md
@@ -0,0 +1,5 @@
+---
+bump: "patch"
+---
+
+Fix the diagnose's `log_dir_path` path check. It now always checks the actual log file's parent directory, rather than the configured path. These two values may differ as the package does a permission check to see if the `logPath` is writable or not.
diff --git a/packages/nodejs/src/diagnose.ts b/packages/nodejs/src/diagnose.ts
index 4ad014b1..1b5327ef 100644
--- a/packages/nodejs/src/diagnose.ts
+++ b/packages/nodejs/src/diagnose.ts
@@ -148,7 +148,7 @@ export class DiagnoseTool {
         path: process.cwd()
       },
       log_dir_path: {
-        path: this.#config.data.logPath!.replace("/appsignal.log", "")
+        path: path.dirname(logFilePath)
       },
       "appsignal.log": {
         path: logFilePath,