diff --git a/index.js b/index.js
index 2a71924..f6f34b9 100644
--- a/index.js
+++ b/index.js
@@ -17,10 +17,6 @@ function parseCacheControl(header) {
         cc[k] = (v === undefined) ? true : v.replace(/^"|"$/g, ''); // TODO: lame unquoting
     }
 
-    // The s-maxage directive also implies the semantics of the proxy-revalidate response directive.
-    if ('s-maxage' in cc) {
-        cc['proxy-revalidate'] = true;
-    }
     return cc;
 }
 
@@ -181,6 +177,9 @@ CachePolicy.prototype = {
         }
 
         if (this._isShared) {
+            if (this._rescc['proxy-revalidate']) {
+                return 0;
+            }
             // if a response includes the s-maxage directive, a shared cache recipient MUST ignore the Expires field.
             if (this._rescc['s-maxage']) {
                 return parseInt(this._rescc['s-maxage'], 10);
diff --git a/test/requesttest.js b/test/requesttest.js
index c14612b..e3072a3 100644
--- a/test/requesttest.js
+++ b/test/requesttest.js
@@ -31,6 +31,23 @@ describe('Request properties', function() {
         assert(cache.storable());
     });
 
+    it('Proxy cacheable auth is OK', function() {
+        const cache = new CachePolicy({method:'GET',headers:{'authorization': 'test'}}, {headers:{'cache-control':'max-age=0,s-maxage=12'}});
+        assert(!cache.stale());
+        assert(cache.storable());
+    });
+
+    it('Private auth is OK', function() {
+        const cache = new CachePolicy({method:'GET',headers:{'authorization': 'test'}}, cacheableResponse, {shared:false});
+        assert(!cache.stale());
+        assert(cache.storable());
+    });
+
+    it('Revalidated auth is OK', function() {
+        const cache = new CachePolicy({headers:{'authorization': 'test'}}, {headers:{'cache-control':'max-age=88,must-revalidate'}});
+        assert(cache.storable());
+    });
+
     it('Auth prevents caching by default', function() {
         const cache = new CachePolicy({method:'GET',headers:{'authorization': 'test'}}, cacheableResponse);
         assert(cache.stale());