diff --git a/src/NzbDrone.Core.Test/ImportListTests/TMDb/TMDbListSettingsValidatorFixture.cs b/src/NzbDrone.Core.Test/ImportListTests/TMDb/TMDbListSettingsValidatorFixture.cs
new file mode 100644
index 000000000..a11e2fcf7
--- /dev/null
+++ b/src/NzbDrone.Core.Test/ImportListTests/TMDb/TMDbListSettingsValidatorFixture.cs
@@ -0,0 +1,38 @@
+using FluentAssertions;
+using NUnit.Framework;
+using NzbDrone.Core.ImportLists.TMDb.List;
+using NzbDrone.Core.Test.Framework;
+
+namespace NzbDrone.Core.Test.ImportListTests.TMDb
+{
+    public class TMDbListSettingsValidatorFixture : CoreTest
+    {
+        [TestCase("")]
+        [TestCase("0")]
+        [TestCase("ls12345678")]
+        [TestCase(null)]
+        public void invalid_listId_should_not_validate(string listId)
+        {
+            var setting = new TMDbListSettings
+            {
+                ListId = listId,
+            };
+
+            setting.Validate().IsValid.Should().BeFalse();
+            setting.Validate().Errors.Should().Contain(c => c.PropertyName == "ListId");
+        }
+
+        [TestCase("1")]
+        [TestCase("706123")]
+        public void valid_listId_should_validate(string listId)
+        {
+            var setting = new TMDbListSettings
+            {
+                ListId = listId,
+            };
+
+            setting.Validate().IsValid.Should().BeTrue();
+            setting.Validate().Errors.Should().NotContain(c => c.PropertyName == "ListId");
+        }
+    }
+}
diff --git a/src/NzbDrone.Core/ImportLists/TMDb/List/TMDbListSettings.cs b/src/NzbDrone.Core/ImportLists/TMDb/List/TMDbListSettings.cs
index 78137b6c5..bb153dd03 100644
--- a/src/NzbDrone.Core/ImportLists/TMDb/List/TMDbListSettings.cs
+++ b/src/NzbDrone.Core/ImportLists/TMDb/List/TMDbListSettings.cs
@@ -1,4 +1,4 @@
-using FluentValidation;
+using FluentValidation;
 using NzbDrone.Core.Annotations;
 
 namespace NzbDrone.Core.ImportLists.TMDb.List
@@ -8,7 +8,7 @@ namespace NzbDrone.Core.ImportLists.TMDb.List
         public TMDbListSettingsValidator()
         : base()
         {
-            RuleFor(c => c.ListId).NotEmpty();
+            RuleFor(c => c.ListId).Matches("^[1-9][0-9]*$").NotEmpty();
         }
     }