diff --git a/src/interfaces.ts b/src/interfaces.ts
index a269e77b..6a8c4ae8 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -115,6 +115,7 @@ interface IBasePtyForkOptions {
 export interface IPtyForkOptions extends IBasePtyForkOptions {
   uid?: number;
   gid?: number;
+  argv0?: string;
 }
 
 export interface IWindowsPtyForkOptions extends IBasePtyForkOptions {
diff --git a/src/native.d.ts b/src/native.d.ts
index c53e086b..ca866cc5 100644
--- a/src/native.d.ts
+++ b/src/native.d.ts
@@ -19,7 +19,7 @@ interface IWinptyNative {
 }
 
 interface IUnixNative {
-  fork(file: string, args: string[], parsedEnv: string[], cwd: string, cols: number, rows: number, uid: number, gid: number, useUtf8: boolean, helperPath: string, onExitCallback: (code: number, signal: number) => void): IUnixProcess;
+  fork(file: string, args: string[], parsedEnv: string[], cwd: string, cols: number, rows: number, uid: number, gid: number, useUtf8: boolean, helperPath: string, onExitCallback: (code: number, signal: number) => void, argv0: string): IUnixProcess;
   open(cols: number, rows: number): IUnixOpenProcess;
   process(fd: number, pty?: string): string;
   resize(fd: number, cols: number, rows: number): void;
diff --git a/src/unix/pty.cc b/src/unix/pty.cc
index 7b4b9e1f..41953fc7 100644
--- a/src/unix/pty.cc
+++ b/src/unix/pty.cc
@@ -262,7 +262,7 @@ Napi::Value PtyFork(const Napi::CallbackInfo& info) {
   Napi::Env napiEnv(info.Env());
   Napi::HandleScope scope(napiEnv);
 
-  if (info.Length() != 11 ||
+  if (info.Length() != 12 ||
       !info[0].IsString() ||
       !info[1].IsArray() ||
       !info[2].IsArray() ||
@@ -273,8 +273,9 @@ Napi::Value PtyFork(const Napi::CallbackInfo& info) {
       !info[7].IsNumber() ||
       !info[8].IsBoolean() ||
       !info[9].IsString() ||
-      !info[10].IsFunction()) {
-    throw Napi::Error::New(napiEnv, "Usage: pty.fork(file, args, env, cwd, cols, rows, uid, gid, utf8, helperPath, onexit)");
+      !info[10].IsFunction() ||
+      !info[11].IsString()) {
+    throw Napi::Error::New(napiEnv, "Usage: pty.fork(file, args, env, cwd, cols, rows, uid, gid, utf8, helperPath, onexit, argv0)");
   }
 
   // file
@@ -351,20 +352,24 @@ Napi::Value PtyFork(const Napi::CallbackInfo& info) {
   // helperPath
   std::string helper_path = info[9].As<Napi::String>();
 
+  // argv0
+  std::string argv0 = info[11].As<Napi::String>();
+
   pid_t pid;
   int master;
 #if defined(__APPLE__)
   int argc = argv_.Length();
-  int argl = argc + 4;
+  int argl = argc + 5;
   std::unique_ptr<char *, DelBuf> argv_unique_ptr(new char *[argl], DelBuf(argl));
   char **argv = argv_unique_ptr.get();
   argv[0] = strdup(helper_path.c_str());
   argv[1] = strdup(cwd_.c_str());
   argv[2] = strdup(file.c_str());
+  argv[3] = strdup(argv0.c_str());
   argv[argl - 1] = NULL;
   for (int i = 0; i < argc; i++) {
     std::string arg = argv_.Get(i).As<Napi::String>();
-    argv[i + 3] = strdup(arg.c_str());
+    argv[i + 4] = strdup(arg.c_str());
   }
 
   int err = -1;
@@ -380,7 +385,7 @@ Napi::Value PtyFork(const Napi::CallbackInfo& info) {
   int argl = argc + 2;
   std::unique_ptr<char *, DelBuf> argv_unique_ptr(new char *[argl], DelBuf(argl));
   char** argv = argv_unique_ptr.get();
-  argv[0] = strdup(file.c_str());
+  argv[0] = strdup(argv0.c_str());
   argv[argl - 1] = NULL;
   for (int i = 0; i < argc; i++) {
     std::string arg = argv_.Get(i).As<Napi::String>();
@@ -436,7 +441,8 @@ Napi::Value PtyFork(const Napi::CallbackInfo& info) {
       {
         char **old = environ;
         environ = env;
-        execvp(argv[0], argv);
+        char* file_ = strdup(file.c_str());
+        execvp(file_, argv);
         environ = old;
         perror("execvp(3) failed.");
         _exit(1);
diff --git a/src/unix/spawn-helper.cc b/src/unix/spawn-helper.cc
index 8066328f..1cb23148 100644
--- a/src/unix/spawn-helper.cc
+++ b/src/unix/spawn-helper.cc
@@ -12,7 +12,7 @@ int main (int argc, char** argv) {
 
   char *cwd = argv[1];
   char *file = argv[2];
-  argv = &argv[2];
+  argv = &argv[3];
 
   if (strlen(cwd) && chdir(cwd) == -1) {
     _exit(1);
diff --git a/src/unixTerminal.test.ts b/src/unixTerminal.test.ts
index 69647468..31e5d4c1 100644
--- a/src/unixTerminal.test.ts
+++ b/src/unixTerminal.test.ts
@@ -362,6 +362,31 @@ if (process.platform !== 'win32') {
           }
         });
       });
+      it('should default argv0 to file', (done) => {
+        const term = new UnixTerminal('/bin/sh',
+          [ '-c', 'echo $0' ]);
+        let argv0 = '';
+        term.on('data', (data) => {
+          argv0 = argv0.concat(data);
+        });
+        term.on('exit', () => {
+          assert.strictEqual(argv0.trim(), '/bin/sh');
+          done();
+        });
+      });
+      it('should allow an alternate argv0', (done) => {
+        const term = new UnixTerminal('/bin/sh',
+          [ '-c', 'echo $0' ],
+          { argv0: 'alternate' });
+        let argv0 = '';
+        term.on('data', (data) => {
+          argv0 = argv0.concat(data);
+        });
+        term.on('exit', () => {
+          assert.strictEqual(argv0.trim(), 'alternate');
+          done();
+        });
+      });
     });
   });
 }
diff --git a/src/unixTerminal.ts b/src/unixTerminal.ts
index 98733dc0..fd215958 100644
--- a/src/unixTerminal.ts
+++ b/src/unixTerminal.ts
@@ -102,8 +102,10 @@ export class UnixTerminal extends Terminal {
       this.emit('exit', code, signal);
     };
 
+    const argv0 = opt.argv0 ?? file;
+
     // fork
-    const term = pty.fork(file, args, parsedEnv, cwd, this._cols, this._rows, uid, gid, (encoding === 'utf8'), helperPath, onexit);
+    const term = pty.fork(file, args, parsedEnv, cwd, this._cols, this._rows, uid, gid, (encoding === 'utf8'), helperPath, onexit, argv0);
 
     this._socket = new tty.ReadStream(term.fd);
     if (encoding !== null) {
diff --git a/typings/node-pty.d.ts b/typings/node-pty.d.ts
index 6f050ff1..2dd5db9d 100644
--- a/typings/node-pty.d.ts
+++ b/typings/node-pty.d.ts
@@ -83,6 +83,14 @@ declare module 'node-pty' {
      */
     uid?: number;
     gid?: number;
+
+    /**
+     * Alternate argv[0] to use instead of the file being launched. Can be used to launch a shell
+     * as a login shell, e.g. using `"-sh"` when launching /bin/sh.
+     *
+     * This setting does nothing on Windows.
+     */
+    argv0?: string;
   }
 
   export interface IWindowsPtyForkOptions extends IBasePtyForkOptions {