diff --git a/source/git-promise.js b/source/git-promise.js
index 94f1cd631..9f936df76 100644
--- a/source/git-promise.js
+++ b/source/git-promise.js
@@ -42,7 +42,8 @@ const gitExecutorProm = (args, retryCount) => {
       let stderr = '';
       let env = JSON.parse(JSON.stringify(process.env));
       env['LC_ALL'] = 'C';
-      const procOpts = { cwd: args.repoPath, maxBuffer: 1024 * 1024 * 100, detached: false, env: env }
+      // Run git detached, so it doesn't try to request passwords from stdin
+      const procOpts = { cwd: args.repoPath, maxBuffer: 1024 * 1024 * 100, detached: true, env: env }
       const gitProcess = child_process.spawn(gitBin, args.commands, procOpts);
       if (args.timeout) {
         setTimeout(() => {
@@ -59,9 +60,8 @@ const gitExecutorProm = (args, retryCount) => {
       } else {
         gitProcess.stdout.on('data', (data) => stdout += data.toString());
       }
-      if (args.inPipe) {
-        gitProcess.stdin.end(args.inPipe);
-      }
+      // Always close stdin, even when there's no inPipe
+      gitProcess.stdin.end(args.inPipe);
       gitProcess.stderr.on('data', (data) => stderr += data.toString());
       gitProcess.on('error', (error) => { rejectedError = error; });