diff --git a/index.d.ts b/index.d.ts
index 29703bd..d5c2f1d 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -114,33 +114,6 @@ declare namespace slugify {
 }
 
 declare const slugify: {
-	/**
-	Slugify a string.
-
-	@param string - String to slugify.
-
-	@example
-	```
-	import slugify = require('@sindresorhus/slugify');
-
-	slugify('I ♥ Dogs');
-	//=> 'i-love-dogs'
-
-	slugify('  Déjà Vu!  ');
-	//=> 'deja-vu'
-
-	slugify('fooBar 123 $#%');
-	//=> 'foo-bar-123'
-
-	slugify('я люблю единорогов');
-	//=> 'ya-lyublyu-edinorogov'
-	```
-	*/
-	(
-		string: string,
-		options?: slugify.Options
-	): string;
-
 	/**
 	Returns a new instance of `slugify(string, options?)` with a counter to handle multiple occurences of the same string.
 
@@ -180,11 +153,6 @@ declare const slugify: {
 	You can then use `slugify.counter()` to generate unique HTML `id`'s to ensure anchors will link to the right headline.
 	*/
 	counter: () => {
-		(
-			string: string,
-			options?: slugify.Options
-		): string;
-
 		/**
 		Reset the counter.
 
@@ -205,8 +173,40 @@ declare const slugify: {
 		//=> 'foo-bar'
 		```
 		*/
-		reset(): void;
+		reset: () => void;
+
+		(
+			string: string,
+			options?: slugify.Options
+		): string;
 	};
-}
+
+	/**
+	Slugify a string.
+
+	@param string - String to slugify.
+
+	@example
+	```
+	import slugify = require('@sindresorhus/slugify');
+
+	slugify('I ♥ Dogs');
+	//=> 'i-love-dogs'
+
+	slugify('  Déjà Vu!  ');
+	//=> 'deja-vu'
+
+	slugify('fooBar 123 $#%');
+	//=> 'foo-bar-123'
+
+	slugify('я люблю единорогов');
+	//=> 'ya-lyublyu-edinorogov'
+	```
+	*/
+	(
+		string: string,
+		options?: slugify.Options
+	): string;
+};
 
 export = slugify;
diff --git a/index.js b/index.js
index 53d635e..21e315e 100644
--- a/index.js
+++ b/index.js
@@ -6,7 +6,7 @@ const builtinOverridableReplacements = require('./overridable-replacements');
 const decamelize = string => {
 	return string
 		// Separate capitalized words.
-		.replace(/([A-Z]{2,})([\d]+)/g, '$1 $2')
+		.replace(/([A-Z]{2,})(\d+)/g, '$1 $2')
 		.replace(/([a-z\d]+)([A-Z]{2,})/g, '$1 $2')
 
 		.replace(/([a-z\d])([A-Z])/g, '$1 $2')
diff --git a/index.test-d.ts b/index.test-d.ts
index b60084e..97c7d2e 100644
--- a/index.test-d.ts
+++ b/index.test-d.ts
@@ -8,6 +8,6 @@ expectType<string>(slugify('fooBar', {decamelize: false}));
 expectType<string>(slugify('I ♥ 🦄 & 🐶', {customReplacements: [['🐶', 'dog']]}));
 expectType<string>(slugify('_foo_bar', {preserveLeadingUnderscore: true}));
 
-// counter
+// Counter
 expectType<string>(slugify.counter()('I ♥ Dogs'));
 expectType<void>(slugify.counter().reset());
diff --git a/package.json b/package.json
index 31edb3d..7b8aa51 100644
--- a/package.json
+++ b/package.json
@@ -42,11 +42,11 @@
 	],
 	"dependencies": {
 		"@sindresorhus/transliterate": "^0.1.0",
-		"escape-string-regexp": "^2.0.0"
+		"escape-string-regexp": "^4.0.0"
 	},
 	"devDependencies": {
 		"ava": "^2.4.0",
 		"tsd": "^0.11.0",
-		"xo": "^0.26.1"
+		"xo": "^0.30.0"
 	}
 }