diff --git a/src/collection.js b/src/collection.js
index 9d0d9ec..f67135b 100644
--- a/src/collection.js
+++ b/src/collection.js
@@ -15,7 +15,7 @@ export class Collection {
 	}
 
 	/**
-	 * @param {string} item
+	 * @param {string | number} item
 	 * @param {import('css-tree').CssLocation} node_location
 	 */
 	p(item, node_location) {
diff --git a/src/index.js b/src/index.js
index 3d1b806..07b9e2d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,6 +1,6 @@
 import parse from 'css-tree/parser'
 import walk from 'css-tree/walker'
-import { calculate } from '@bramus/specificity/core'
+import { calculateForAST } from '@bramus/specificity/core'
 import { isSupportsBrowserhack, isMediaBrowserhack } from './atrules/atrules.js'
 import { getCombinators, getComplexity, isAccessibility, isPrefixed, hasPseudoClass } from './selectors/utils.js'
 import { colorFunctions, colorKeywords, namedColors, systemColors } from './values/colors.js'
@@ -326,15 +326,10 @@ export function analyze(css, options = {}) {
         uniqueSelectorComplexities.p(complexity, node.loc)
 
         // #region specificity
-        let [{ value: specificityObj }] = calculate(node)
-        let sa = specificityObj.a
-        let sb = specificityObj.b
-        let sc = specificityObj.c
+        let specificity = calculateForAST(node).toArray()
+        let [sa, sb, sc] = specificity
 
-        /** @type {Specificity} */
-        let specificity = [sa, sb, sc]
-
-        uniqueSpecificities.p(sa + ',' + sb + ',' + sc, node.loc)
+        uniqueSpecificities.p(specificity.toString(), node.loc)
 
         specificityA.push(sa)
         specificityB.push(sb)