diff --git a/CHANGELOG.md b/CHANGELOG.md
index d3c3ce9..418a269 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 All notable changes to the "keil-assistant" extension will be documented in this file.
 
+## [v1.8.7]
+- Fixed:
+- Build log are garbled
+***
+
 ## [v1.8.6]
 - Fixed:
 - Keil log out show
diff --git a/package.json b/package.json
index b57e66b..79ce27a 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "keil-vscode-assistant",
   "displayName": "%displayName%",
   "description": "%description%",
-  "version": "1.8.6",
+  "version": "1.8.7",
   "publisher": "jacksonjim",
   "icon": "res/icons/icon.png",
   "author": "jacksonjim <jacksonjim@foxmail.com>",
diff --git a/src/extension.ts b/src/extension.ts
index ae01e0e..cbf34a5 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -778,12 +778,16 @@ abstract class Target implements IView {
         const fd = openSync(this.uv4LogFile.path, 'r');
         const watcher = workspace.createFileSystemWatcher(this.uv4LogFile.path, false, false, false);
         let curPos = 0;
+        const buf = Buffer.alloc(1024);
         watcher.onDidChange(() => {
             const stats = statSync(this.uv4LogFile.path);
             if (stats && stats.size > 0) {
-                const buf = Buffer.alloc(1024);
-                curPos += readSync(fd, buf, 0, 1024, curPos);
-                this.taskChannel?.appendLine(this.dealBuildLog(buf));
+                const numRead = readSync(fd, buf, 0, 1024, curPos);
+                if (numRead > 0) {
+                    curPos += numRead;
+                    const txt = this.dealBuildLog(buf.slice(0, numRead));
+                    this.taskChannel?.appendLine(txt);
+                }
             }
         });