diff --git a/src/NzbDrone.Core.Test/Files/Indexers/Torznab/torznab_animetosho_caps.xml b/src/NzbDrone.Core.Test/Files/Indexers/Torznab/torznab_animetosho_caps.xml
new file mode 100644
index 000000000..e8bbf2930
--- /dev/null
+++ b/src/NzbDrone.Core.Test/Files/Indexers/Torznab/torznab_animetosho_caps.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<caps>
+	<server version="1.0" title="Anime Tosho" strapline="Anime NZB/DDL mirror" url="https://animetosho.org/"/>
+	<limits max="200" default="75"/>
+	<retention days="9999"/>
+	<registration available="no" open="yes" />
+	<searching>
+		<search available="yes" supportedParams="q" />
+		<tv-search available="no" supportedParams="q" />
+		<movie-search available="no" supportedParams="q" />
+	</searching>
+	<categories>
+		<category id="5070" name="Anime" description="Anime"/>
+	</categories>
+</caps>
\ No newline at end of file
diff --git a/src/NzbDrone.Core.Test/IndexerTests/NewznabTests/NewznabCapabilitiesProviderFixture.cs b/src/NzbDrone.Core.Test/IndexerTests/NewznabTests/NewznabCapabilitiesProviderFixture.cs
index 085188d5a..e643263f7 100644
--- a/src/NzbDrone.Core.Test/IndexerTests/NewznabTests/NewznabCapabilitiesProviderFixture.cs
+++ b/src/NzbDrone.Core.Test/IndexerTests/NewznabTests/NewznabCapabilitiesProviderFixture.cs
@@ -84,6 +84,19 @@ namespace NzbDrone.Core.Test.IndexerTests.NewznabTests
             bookCats.Should().Contain("8000");
         }
 
+        [Test]
+        public void should_find_sub_categories_as_main_categories()
+        {
+            GivenCapsResponse(ReadAllText("Files/Indexers/Torznab/torznab_animetosho_caps.xml"));
+
+            var caps = Subject.GetCapabilities(_settings, _definition);
+
+            var bookCats = caps.Categories.MapTrackerCatToNewznab("5070");
+
+            bookCats.Count.Should().Be(2);
+            bookCats.First().Id.Should().Be(5070);
+        }
+
         [Test]
         public void should_map_by_name_when_available()
         {
diff --git a/src/NzbDrone.Core/Indexers/Definitions/Newznab/NewznabCapabilitiesProvider.cs b/src/NzbDrone.Core/Indexers/Definitions/Newznab/NewznabCapabilitiesProvider.cs
index 1d3952bf2..acdecca56 100644
--- a/src/NzbDrone.Core/Indexers/Definitions/Newznab/NewznabCapabilitiesProvider.cs
+++ b/src/NzbDrone.Core/Indexers/Definitions/Newznab/NewznabCapabilitiesProvider.cs
@@ -223,9 +223,16 @@ namespace NzbDrone.Core.Indexers.Newznab
                 foreach (var xmlCategory in xmlCategories.Elements("category"))
                 {
                     var parentName = xmlCategory.Attribute("name").Value;
+                    var parentNameLower = parentName?.ToLowerInvariant();
                     var parentId = int.Parse(xmlCategory.Attribute("id").Value);
 
-                    var mappedCat = NewznabStandardCategory.ParentCats.FirstOrDefault(x => parentName.ToLower().Contains(x.Name.ToLower()));
+                    var mappedCat = NewznabStandardCategory.ParentCats.FirstOrDefault(x => parentNameLower.Contains(x.Name.ToLower()));
+
+                    if (mappedCat == null)
+                    {
+                        // Try to find name and Id in AllCats for sub cats that are mapped as parents
+                        mappedCat = NewznabStandardCategory.AllCats.FirstOrDefault(x => x.Id == parentId && x.Name.ToLower().Contains(parentNameLower));
+                    }
 
                     if (mappedCat == null)
                     {