diff --git a/__tests__/sanity.test.js b/__tests__/sanity.test.js
index 516d425f6..d452f6257 100644
--- a/__tests__/sanity.test.js
+++ b/__tests__/sanity.test.js
@@ -17,3 +17,11 @@ it('generates the right CSS', () => {
       expect(result.css).toBe(expected)
     })
 })
+
+it('does not add any CSS if no Tailwind features are used', () => {
+  return postcss([tailwind()])
+    .process('')
+    .then(result => {
+      expect(result.css).toBe('')
+    })
+})
diff --git a/src/lib/substituteResponsiveAtRules.js b/src/lib/substituteResponsiveAtRules.js
index 98b306c3f..9f2ec7b76 100644
--- a/src/lib/substituteResponsiveAtRules.js
+++ b/src/lib/substituteResponsiveAtRules.js
@@ -29,7 +29,10 @@ export default function(config) {
           return cloned
         })
       )
-      css.append(mediaQuery)
+
+      if (mediaQuery.nodes.length) {
+        css.append(mediaQuery)
+      }
     })
   }
 }