diff --git a/lib/helpers/parseProtocol.js b/lib/helpers/parseProtocol.js
index 1ad6658c..05a2d6d2 100644
--- a/lib/helpers/parseProtocol.js
+++ b/lib/helpers/parseProtocol.js
@@ -1,6 +1,6 @@
 'use strict';
 
 export default function parseProtocol(url) {
-  const match = /^([-+\w]{1,25})(:?\/\/|:)/.exec(url);
+  const match = /^([-+\w]{1,25}):(?:\/\/)?/.exec(url);
   return (match && match[1]) || '';
 }
diff --git a/tests/unit/parseProtocol.test.js b/tests/unit/parseProtocol.test.js
index 6a295f36..ec546efe 100644
--- a/tests/unit/parseProtocol.test.js
+++ b/tests/unit/parseProtocol.test.js
@@ -25,4 +25,8 @@ describe('helpers::parseProtocol', () => {
       }
     );
   });
+
+  it('should not match URLs without a colon separator', () => {
+    assert.strictEqual(parseProtocol('http//example.com'), '');
+  });
 });