diff --git a/packages/hint-http-cache/src/hint.ts b/packages/hint-http-cache/src/hint.ts
index 1fbdbc48d96..145c91026f5 100644
--- a/packages/hint-http-cache/src/hint.ts
+++ b/packages/hint-http-cache/src/hint.ts
@@ -123,6 +123,11 @@ export default class HttpCacheHint implements IHint {
             const parsedCacheControlHeader = usedDirectives.reduce((parsed: ParsedDirectives, current: string) => {
                 const [directive, value] = current.split('=');
 
+                // Empty string, e.g. `cache-control: max-age=12345,` --> `['max-age=123456', '']`
+                if (!directive) {
+                    return parsed;
+                }
+
                 // Validate directive with value. E.g.: max-age=<seconds>
                 if (directive && value) {
                     /*
diff --git a/packages/hint-http-cache/tests/tests.ts b/packages/hint-http-cache/tests/tests.ts
index 7e4d22a00d9..c493d967266 100644
--- a/packages/hint-http-cache/tests/tests.ts
+++ b/packages/hint-http-cache/tests/tests.ts
@@ -178,6 +178,17 @@ const defaultTests: HintTest[] = [
             }
         }
     },
+    {
+        name: `Asset with "Cache-Control: max-age=31536000," header fails`,
+        reports: [{ message: 'Static resources should use the "immutable" directive:\nDirectives used: max-age=31536000,' }],
+        serverConfig: {
+            '/': generateHTMLPage('<link rel="icon" href="/favicon.123.ico">'),
+            '/favicon.123.ico': {
+                content: '',
+                headers: { 'Cache-Control': 'max-age=31536000,' }
+            }
+        }
+    },
     {
         name: 'JS with "Cache-Control: no-cache" fails',
         reports: [