diff --git a/dist/index.js b/dist/index.js
index 993ad462..0ce0204b 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -964,33 +964,34 @@ class GitCommandManager {
         });
     }
     exec(args_1) {
-        return __awaiter(this, arguments, void 0, function* (args, opts = {}) {
-            var _a;
+        return __awaiter(this, arguments, void 0, function* (args, { encoding = 'utf8', allowAllExitCodes = false } = {}) {
             const result = new GitOutput();
             const env = {};
             for (const key of Object.keys(process.env)) {
                 env[key] = process.env[key];
             }
             const stdout = [];
+            let stdoutLength = 0;
             const stderr = [];
+            let stderrLength = 0;
             const options = {
                 cwd: this.workingDirectory,
                 env,
-                ignoreReturnCode: (_a = opts.allowAllExitCodes) !== null && _a !== void 0 ? _a : false,
+                ignoreReturnCode: allowAllExitCodes,
                 listeners: {
                     stdout: (data) => {
-                        var _a;
-                        stdout.push(data.toString((_a = opts.encoding) !== null && _a !== void 0 ? _a : 'utf8'));
+                        stdout.push(data);
+                        stdoutLength += data.length;
                     },
                     stderr: (data) => {
-                        var _a;
-                        stderr.push(data.toString((_a = opts.encoding) !== null && _a !== void 0 ? _a : 'utf8'));
+                        stderr.push(data);
+                        stderrLength += data.length;
                     }
                 }
             };
             result.exitCode = yield exec.exec(`"${this.gitPath}"`, args, options);
-            result.stdout = stdout.join('');
-            result.stderr = stderr.join('');
+            result.stdout = Buffer.concat(stdout, stdoutLength).toString(encoding);
+            result.stderr = Buffer.concat(stderr, stderrLength).toString(encoding);
             return result;
         });
     }
diff --git a/src/git-command-manager.ts b/src/git-command-manager.ts
index 47e3937f..1649c3f0 100644
--- a/src/git-command-manager.ts
+++ b/src/git-command-manager.ts
@@ -360,7 +360,7 @@ export class GitCommandManager {
     return stdout
   }
 
-  async exec(args: string[], opts: ExecOpts = {}): Promise<GitOutput> {
+  async exec(args: string[], { encoding = 'utf8', allowAllExitCodes = false }: ExecOpts = {}): Promise<GitOutput> {
     const result = new GitOutput()
 
     const env = {}
@@ -368,26 +368,30 @@ export class GitCommandManager {
       env[key] = process.env[key]
     }
 
-    const stdout: string[] = []
-    const stderr: string[] = []
+    const stdout: Buffer[] = []
+    let stdoutLength = 0
+    const stderr: Buffer[] = []
+    let stderrLength = 0
 
     const options = {
       cwd: this.workingDirectory,
       env,
-      ignoreReturnCode: opts.allowAllExitCodes ?? false,
+      ignoreReturnCode: allowAllExitCodes,
       listeners: {
         stdout: (data: Buffer) => {
-          stdout.push(data.toString(opts.encoding ?? 'utf8'))
+          stdout.push(data)
+          stdoutLength += data.length
         },
         stderr: (data: Buffer) => {
-          stderr.push(data.toString(opts.encoding ?? 'utf8'))
+          stderr.push(data)
+          stderrLength += data.length
         }
       }
     }
 
     result.exitCode = await exec.exec(`"${this.gitPath}"`, args, options)
-    result.stdout = stdout.join('')
-    result.stderr = stderr.join('')
+    result.stdout = Buffer.concat(stdout, stdoutLength).toString(encoding)
+    result.stderr = Buffer.concat(stderr, stderrLength).toString(encoding)
     return result
   }
 }