diff --git a/index.js b/index.js
index d914070..14d4e3c 100644
--- a/index.js
+++ b/index.js
@@ -6,13 +6,13 @@ module.exports = (string, separator) => {
 	}
 
 	if (separator === '') {
-		return [string];
+		return [];
 	}
 
 	const separatorIndex = string.indexOf(separator);
 
 	if (separatorIndex === -1) {
-		return [string];
+		return [];
 	}
 
 	return [
diff --git a/readme.md b/readme.md
index 2463cf1..8380dc6 100644
--- a/readme.md
+++ b/readme.md
@@ -4,14 +4,12 @@
 
 This is similar to [`String#split()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/split), but that one splits on all the occurrences, not just the first one.
 
-
 ## Install
 
 ```
 $ npm install split-on-first
 ```
 
-
 ## Usage
 
 ```js
@@ -27,9 +25,11 @@ splitOnFirst('a---b---c', '---');
 //=> ['a', 'b---c']
 
 splitOnFirst('a-b-c', '+');
-//=> ['a-b-c']
-```
+//=> []
 
+splitOnFirst('abc', '');
+//=> []
+```
 
 ## API
 
@@ -47,12 +47,10 @@ Type: `string`
 
 The separator to split on.
 
-
 ## Related
 
 - [split-at](https://github.com/sindresorhus/split-at) - Split a string at one or more indices
 
-
 ## License
 
 MIT © [Sindre Sorhus](https://sindresorhus.com)
diff --git a/test.js b/test.js
index 9b7ddf2..10f00e8 100644
--- a/test.js
+++ b/test.js
@@ -5,8 +5,8 @@ test('main', t => {
 	t.deepEqual(splitOnFirst('a-b-c', '-'), ['a', 'b-c']);
 	t.deepEqual(splitOnFirst('key:value:value2', ':'), ['key', 'value:value2']);
 	t.deepEqual(splitOnFirst('a---b---c', '---'), ['a', 'b---c']);
-	t.deepEqual(splitOnFirst('a-b-c', '+'), ['a-b-c']);
-	t.deepEqual(splitOnFirst('abc', ''), ['abc']);
+	t.deepEqual(splitOnFirst('a-b-c', '+'), []);
+	t.deepEqual(splitOnFirst('abc', ''), []);
 
 	t.throws(() => {
 		splitOnFirst('abc', null);