diff --git a/src/FilterStorage.cs b/src/FilterStorage.cs
index 163751e..3cdf170 100644
--- a/src/FilterStorage.cs
+++ b/src/FilterStorage.cs
@@ -9,7 +9,7 @@ namespace MoonTools.ECS
 		private EntityStorage EntityStorage;
 		private TypeIndices ComponentTypeIndices;
 		private Dictionary<FilterSignature, IndexableSet<Entity>> filterSignatureToEntityIDs = new Dictionary<FilterSignature, IndexableSet<Entity>>();
-		private Dictionary<int, HashSet<FilterSignature>> typeToFilterSignatures = new Dictionary<int, HashSet<FilterSignature>>();
+		private Dictionary<int, List<FilterSignature>> typeToFilterSignatures = new Dictionary<int, List<FilterSignature>>();
 
 		private Dictionary<FilterSignature, Action<Entity>> addCallbacks = new Dictionary<FilterSignature, Action<Entity>>();
 		private Dictionary<FilterSignature, Action<Entity>> removeCallbacks = new Dictionary<FilterSignature, Action<Entity>>();
@@ -31,7 +31,7 @@ namespace MoonTools.ECS
 				{
 					if (!typeToFilterSignatures.ContainsKey(type))
 					{
-						typeToFilterSignatures.Add(type, new HashSet<FilterSignature>());
+						typeToFilterSignatures.Add(type, new List<FilterSignature>());
 					}
 
 					typeToFilterSignatures[type].Add(filterSignature);
@@ -41,7 +41,7 @@ namespace MoonTools.ECS
 				{
 					if (!typeToFilterSignatures.ContainsKey(type))
 					{
-						typeToFilterSignatures.Add(type, new HashSet<FilterSignature>());
+						typeToFilterSignatures.Add(type, new List<FilterSignature>());
 					}
 
 					typeToFilterSignatures[type].Add(filterSignature);