diff --git a/src/NzbDrone.Core/Indexers/Definitions/SceneHD.cs b/src/NzbDrone.Core/Indexers/Definitions/SceneHD.cs
index e554c4d33..c3d24df2f 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/SceneHD.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/SceneHD.cs
@@ -38,7 +38,7 @@ namespace NzbDrone.Core.Indexers.Definitions
 
         public override IIndexerRequestGenerator GetRequestGenerator()
         {
-            return new SceneHDRequestGenerator() { Settings = Settings, Capabilities = Capabilities };
+            return new SceneHDRequestGenerator(Settings, Capabilities);
         }
 
         public override IParseIndexerResponse GetParser()
@@ -88,38 +88,42 @@ namespace NzbDrone.Core.Indexers.Definitions
 
     public class SceneHDRequestGenerator : IIndexerRequestGenerator
     {
-        public SceneHDSettings Settings { get; set; }
-        public IndexerCapabilities Capabilities { get; set; }
-        public string BaseUrl { get; set; }
+        private readonly SceneHDSettings _settings;
+        private readonly IndexerCapabilities _capabilities;
+
+        public SceneHDRequestGenerator(SceneHDSettings settings, IndexerCapabilities capabilities)
+        {
+            _settings = settings;
+            _capabilities = capabilities;
+        }
 
         private IEnumerable<IndexerRequest> GetPagedRequests(string term, int[] categories, string imdbId = null)
         {
             var search = new[] { imdbId, term };
 
-            var qc = new NameValueCollection
+            var parameters = new NameValueCollection
             {
                 { "api", "" },
-                { "passkey", Settings.Passkey },
+                { "passkey", _settings.Passkey },
+                { "search", string.Join(" ", search.Where(s => s.IsNotNullOrWhiteSpace())) },
                 { "search", string.Join(" ", search.Where(s => s.IsNotNullOrWhiteSpace())) }
             };
 
-            foreach (var cat in Capabilities.Categories.MapTorznabCapsToTrackers(categories))
+            if (categories?.Length > 0)
             {
-                qc.Add("categories[" + cat + "]", "1");
+                parameters.Add("cat", _capabilities.Categories.MapTorznabCapsToTrackers(categories).Distinct().Join(","));
             }
 
-            var searchUrl = string.Format("{0}/browse.php?{1}", Settings.BaseUrl.TrimEnd('/'), qc.GetQueryString());
-
-            var request = new IndexerRequest(searchUrl, HttpAccept.Json);
+            var searchUrl = $"{_settings.BaseUrl.TrimEnd('/')}/browse.php?{parameters.GetQueryString()}";
 
-            yield return request;
+            yield return new IndexerRequest(searchUrl, HttpAccept.Json);
         }
 
         public IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria searchCriteria)
         {
             var pageableRequests = new IndexerPageableRequestChain();
 
-            pageableRequests.Add(GetPagedRequests(string.Format("{0}", searchCriteria.SanitizedSearchTerm), searchCriteria.Categories, searchCriteria.FullImdbId));
+            pageableRequests.Add(GetPagedRequests($"{searchCriteria.SanitizedSearchTerm}", searchCriteria.Categories, searchCriteria.FullImdbId));
 
             return pageableRequests;
         }
@@ -128,7 +132,7 @@ namespace NzbDrone.Core.Indexers.Definitions
         {
             var pageableRequests = new IndexerPageableRequestChain();
 
-            pageableRequests.Add(GetPagedRequests(string.Format("{0}", searchCriteria.SanitizedSearchTerm), searchCriteria.Categories));
+            pageableRequests.Add(GetPagedRequests($"{searchCriteria.SanitizedSearchTerm}", searchCriteria.Categories));
 
             return pageableRequests;
         }
@@ -137,7 +141,7 @@ namespace NzbDrone.Core.Indexers.Definitions
         {
             var pageableRequests = new IndexerPageableRequestChain();
 
-            pageableRequests.Add(GetPagedRequests(string.Format("{0}", searchCriteria.SanitizedTvSearchString), searchCriteria.Categories, searchCriteria.FullImdbId));
+            pageableRequests.Add(GetPagedRequests($"{searchCriteria.SanitizedTvSearchString}", searchCriteria.Categories, searchCriteria.FullImdbId));
 
             return pageableRequests;
         }
@@ -146,7 +150,7 @@ namespace NzbDrone.Core.Indexers.Definitions
         {
             var pageableRequests = new IndexerPageableRequestChain();
 
-            pageableRequests.Add(GetPagedRequests(string.Format("{0}", searchCriteria.SanitizedSearchTerm), searchCriteria.Categories));
+            pageableRequests.Add(GetPagedRequests($"{searchCriteria.SanitizedSearchTerm}", searchCriteria.Categories));
 
             return pageableRequests;
         }
@@ -155,7 +159,7 @@ namespace NzbDrone.Core.Indexers.Definitions
         {
             var pageableRequests = new IndexerPageableRequestChain();
 
-            pageableRequests.Add(GetPagedRequests(string.Format("{0}", searchCriteria.SanitizedSearchTerm), searchCriteria.Categories));
+            pageableRequests.Add(GetPagedRequests($"{searchCriteria.SanitizedSearchTerm}", searchCriteria.Categories));
 
             return pageableRequests;
         }