diff --git a/src/Authoring/Configs/CacheStoreValueConfig.cs b/src/Authoring/Configs/CacheStoreValueConfig.cs
index 8d4e667..69c199e 100644
--- a/src/Authoring/Configs/CacheStoreValueConfig.cs
+++ b/src/Authoring/Configs/CacheStoreValueConfig.cs
@@ -29,7 +29,7 @@ public record CacheStoreValueConfig
     /// Policy expressions are allowed.
     /// </summary>
     [ExpressionAllowed]
-    public required uint Duration { get; init; }
+    public required int Duration { get; init; }
 
     /// <summary>
     /// Optional. One of the following values: prefer-external, external, internal.<br/>
diff --git a/src/Authoring/IFragmentContext.cs b/src/Authoring/IFragmentContext.cs
index 62de64c..3358b46 100644
--- a/src/Authoring/IFragmentContext.cs
+++ b/src/Authoring/IFragmentContext.cs
@@ -148,7 +148,7 @@ public interface IFragmentContext : IHaveExpressionContext
     /// <param name="cacheResponse">
     /// Indicates whether the response should be cached. If set to false, the response will not be cached. Policy expressions are allowed.
     /// </param>
-    void CacheStore([ExpressionAllowed] uint duration, [ExpressionAllowed] bool? cacheResponse);
+    void CacheStore([ExpressionAllowed] int duration, [ExpressionAllowed] bool? cacheResponse);
 
     /// <summary>
     /// Stores a value in the cache using a specified key.<br/>
diff --git a/src/Authoring/IOutboundContext.cs b/src/Authoring/IOutboundContext.cs
index 3daf9e2..92948f0 100644
--- a/src/Authoring/IOutboundContext.cs
+++ b/src/Authoring/IOutboundContext.cs
@@ -82,7 +82,7 @@ public interface IOutboundContext : IHaveExpressionContext
     /// <param name="cacheResponse">
     /// Indicates whether the response should be cached. If set to false, the response will not be cached. Policy expressions are allowed.
     /// </param>
-    void CacheStore([ExpressionAllowed] uint duration, [ExpressionAllowed] bool? cacheResponse);
+    void CacheStore([ExpressionAllowed] int duration, [ExpressionAllowed] bool? cacheResponse);
 
     /// <summary>
     /// Stores a value in the cache using a specified key.<br/>
diff --git a/src/Testing/Emulator/Data/CacheStore.cs b/src/Testing/Emulator/Data/CacheStore.cs
index 43e2b8d..1fc5db8 100644
--- a/src/Testing/Emulator/Data/CacheStore.cs
+++ b/src/Testing/Emulator/Data/CacheStore.cs
@@ -28,13 +28,13 @@ public CacheStore WithExternalCacheSetup(bool isSetup = true)
         return this;
     }
 
-    public CacheStore WithExternalCacheValue(string key, object value, uint duration = 10)
+    public CacheStore WithExternalCacheValue(string key, object value, int duration = 10)
     {
         _externalCache.Add(key, new CacheValue(value, duration));
         return this;
     }
 
-    public CacheStore WithInternalCacheValue(string key, object value, uint duration = 10)
+    public CacheStore WithInternalCacheValue(string key, object value, int duration = 10)
     {
         _internalCache.Add(key, new CacheValue(value, duration));
         return this;
diff --git a/src/Testing/Emulator/Data/CacheValue.cs b/src/Testing/Emulator/Data/CacheValue.cs
index 072dc66..5382255 100644
--- a/src/Testing/Emulator/Data/CacheValue.cs
+++ b/src/Testing/Emulator/Data/CacheValue.cs
@@ -3,4 +3,4 @@
 
 namespace Microsoft.Azure.ApiManagement.PolicyToolkit.Testing.Emulator.Data;
 
-public record CacheValue(object Value, uint Duration = 0);
\ No newline at end of file
+public record CacheValue(object Value, int Duration = 0);
\ No newline at end of file