diff --git a/packages/tailwindcss-class-names/package-lock.json b/packages/tailwindcss-class-names/package-lock.json
index 3faef87..6f9f6f4 100644
--- a/packages/tailwindcss-class-names/package-lock.json
+++ b/packages/tailwindcss-class-names/package-lock.json
@@ -4459,6 +4459,17 @@
       "integrity": "sha1-AerA/jta9xoqbAL+q7jB/vfgDqs=",
       "dev": true
     },
+    "postcss": {
+      "version": "7.0.27",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.27.tgz",
+      "integrity": "sha512-WuQETPMcW9Uf1/22HWUWP9lgsIC+KEHg2kozMflKjbeUtw9ujvFX6QmIfozaErDkmLWS9WEnEdEe6Uo9/BNTdQ==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.4.2",
+        "source-map": "^0.6.1",
+        "supports-color": "^6.1.0"
+      }
+    },
     "postcss-selector-parser": {
       "version": "6.0.2",
       "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.2.tgz",
@@ -5300,6 +5311,15 @@
       "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==",
       "dev": true
     },
+    "supports-color": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
+      "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+      "dev": true,
+      "requires": {
+        "has-flag": "^3.0.0"
+      }
+    },
     "supports-hyperlinks": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/supports-hyperlinks/-/supports-hyperlinks-2.1.0.tgz",
diff --git a/packages/tailwindcss-class-names/package.json b/packages/tailwindcss-class-names/package.json
index 96d9310..9562153 100644
--- a/packages/tailwindcss-class-names/package.json
+++ b/packages/tailwindcss-class-names/package.json
@@ -27,6 +27,7 @@
   "devDependencies": {
     "@zeit/ncc": "^0.21.1",
     "esm": "^3.2.25",
-    "jest": "^25.1.0"
+    "jest": "^25.1.0",
+    "postcss": "^7.0.27"
   }
 }
diff --git a/packages/tailwindcss-class-names/tests/extractClassNames.test.js b/packages/tailwindcss-class-names/tests/extractClassNames.test.js
index 19290e6..7e7b647 100644
--- a/packages/tailwindcss-class-names/tests/extractClassNames.test.js
+++ b/packages/tailwindcss-class-names/tests/extractClassNames.test.js
@@ -121,9 +121,9 @@ test('foo', async () => {
   })
 })
 
-test.only('processes basic css', async () => {
+test('processes basic css', async () => {
   const result = await processCss(`
-    .bg-red\\:foo {
+    .bg-red {
       background-color: red;
     }
   `)