diff --git a/src/unix.js b/src/unix.js
index 93c770274..3403172ef 100644
--- a/src/unix.js
+++ b/src/unix.js
@@ -150,5 +150,5 @@ export function getShellName({ env, shell }, { resolveExecutable }) {
  * @returns {boolean} `true` if the shell is supported, `false` otherwise.
  */
 export function isShellSupported(shellName) {
-  return getEscapeFunction(shellName, {}) !== undefined;
+  return getEscapeFunction(shellName) !== undefined;
 }
diff --git a/src/win.js b/src/win.js
index ee3a4396d..2a16d9845 100644
--- a/src/win.js
+++ b/src/win.js
@@ -133,5 +133,5 @@ export function getShellName({ env, shell }, { resolveExecutable }) {
  * @returns {boolean} `true` if the shell is supported, `false` otherwise.
  */
 export function isShellSupported(shellName) {
-  return getEscapeFunction(shellName, {}) !== undefined;
+  return getEscapeFunction(shellName) !== undefined;
 }