diff --git a/index.js b/index.js
index 9980625..7ac1bff 100644
--- a/index.js
+++ b/index.js
@@ -217,5 +217,5 @@ function exitmsg (code, signal) {
  * Quote value for `exec`.
  */
 function quote (str) {
-  return `'${str.replace(/'/g, "'\\''")}'`
-}
\ No newline at end of file
+  return `"${str.replace(/["\\$`!]/g, '\\$&')}"`
+}