diff --git a/index.js b/index.js
index 4378e1d..6f9237a 100644
--- a/index.js
+++ b/index.js
@@ -195,7 +195,7 @@ module.exports = function (args, opts) {
 
 				if (
 					(/[A-Za-z]/).test(letters[j])
-					&& (/-?\d+(\.\d*)?(e-?\d+)?$/).test(next)
+					&& (/^-?\d+(\.\d*)?(e-?\d+)?$/).test(next)
 				) {
 					setArg(letters[j], next, arg);
 					broken = true;
diff --git a/test/short.js b/test/short.js
index 4a7b843..ec06579 100644
--- a/test/short.js
+++ b/test/short.js
@@ -12,6 +12,11 @@ test('numeric short args', function (t) {
 	);
 });
 
+test('partial numeric short args', function (t) {
+	t.plan(1);
+	t.deepEqual(parse(['-n1b3']), { n: true, 1: true, b: 3, _: [] });
+});
+
 test('short', function (t) {
 	t.deepEqual(
 		parse(['-b']),