diff --git a/CHANGELOG.md b/CHANGELOG.md
index d76a381ddc..ad7f0afd6c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,8 @@ All notable changes to the Zowe Installer will be documented in this file.
 <!--Add the PR or issue number to the entry if available.-->
 
 ## `2.18.1`
-- Bugfix: When `--log-dir` parameter for `zwe` command is a file, there might be an error "InternalError: stack overflow". [#40nn](https://github.com/zowe/zowe-install-packaging/pull/40nn)
+- Bugfix: When logging `zwe` command, sometimes the log has wrong file tag and the log is unreadable. [#40nn](https://github.com/zowe/zowe-install-packaging/pull/40nn)
+- Bugfix: When `--log-dir` parameter for `zwe` command is a file, there might be an error "InternalError: stack overflow". [#4063](https://github.com/zowe/zowe-install-packaging/pull/4063)
 - Bugfix: Error message `ZWEL0141E` did not print user ID. [#3971](https://github.com/zowe/zowe-install-packaging/pull/3971)
 
 ## `2.17.0`
diff --git a/bin/libs/common.ts b/bin/libs/common.ts
index 7eabf33f5f..bee6a059f4 100644
--- a/bin/libs/common.ts
+++ b/bin/libs/common.ts
@@ -128,36 +128,21 @@ export function date(...args: string[]): string|undefined {
 
 
 let logExists = false;
-let logFile:std.File|null = null;
 
 function writeLog(message: string): boolean {
+  const filename = std.getenv('ZWE_PRIVATE_LOG_FILE');
+  if (!filename) {
+      return false;
+  }
+  logExists = fs.fileExists(filename);
   if (!logExists) {
-    const filename = std.getenv('ZWE_PRIVATE_LOG_FILE');
-    if (filename) {
+      fs.createFile(filename, 0o640, message);
       logExists = fs.fileExists(filename);
-      if (!logExists) {
-        fs.createFile(filename, 0o640, message);
-        logExists = fs.fileExists(filename);
-      }
-      if (logExists) {
-        let errObj = {errno:undefined};
-        logFile = std.open(filename, 'w', errObj);
-        if (errObj.errno) {
-          printError(`Error opening file ${filename}, errno=${errObj.errno}`);
-          logFile=null;
-          logExists=false;
-          return false;
-        }
-      }
-    }
-  }
-  if (logFile===undefined || logFile===null) {
-    return false;
   } else {
-    //TODO this does utf8. should we flip it to 1047 on zos?
-    logFile.puts(message);
-    return true;
+      xplatform.appendFileUTF8(filename, xplatform.AUTO_DETECT, message);
+      return true;
   }
+  return logExists;
 }