diff --git a/lib/option.js b/lib/option.js
index 4a0bd7fac72a8fcfcec620efd78c517dcc7045b8..353a09f34262a47727f7dfc1837fafa4d63f25e1 100644
--- a/lib/option.js
+++ b/lib/option.js
@@ -328,8 +328,8 @@ function camelcase(str) {
 function splitOptionFlags(flags) {
   let shortFlag;
   let longFlag;
-  // short flag, single dash and single character
-  const shortFlagExp = /^-[^-]$/;
+  // short flag, single dash and one or more characters (allow multi-char like -d2e)
+  const shortFlagExp = /^-[^-]+$/;
   // long flag, double dash and at least one character
   const longFlagExp = /^--[^-]/;