diff --git a/src/libraries/Microsoft.Extensions.Caching.Abstractions/ref/Microsoft.Extensions.Caching.Abstractions.cs b/src/libraries/Microsoft.Extensions.Caching.Abstractions/ref/Microsoft.Extensions.Caching.Abstractions.cs
index 3bda5a0a27b00..75f7bd59ecce7 100644
--- a/src/libraries/Microsoft.Extensions.Caching.Abstractions/ref/Microsoft.Extensions.Caching.Abstractions.cs
+++ b/src/libraries/Microsoft.Extensions.Caching.Abstractions/ref/Microsoft.Extensions.Caching.Abstractions.cs
@@ -55,7 +55,7 @@ public static partial class CacheEntryExtensions
         public static Microsoft.Extensions.Caching.Memory.ICacheEntry SetPriority(this Microsoft.Extensions.Caching.Memory.ICacheEntry entry, Microsoft.Extensions.Caching.Memory.CacheItemPriority priority) { throw null; }
         public static Microsoft.Extensions.Caching.Memory.ICacheEntry SetSize(this Microsoft.Extensions.Caching.Memory.ICacheEntry entry, long size) { throw null; }
         public static Microsoft.Extensions.Caching.Memory.ICacheEntry SetSlidingExpiration(this Microsoft.Extensions.Caching.Memory.ICacheEntry entry, System.TimeSpan offset) { throw null; }
-        public static Microsoft.Extensions.Caching.Memory.ICacheEntry SetValue(this Microsoft.Extensions.Caching.Memory.ICacheEntry entry, object value) { throw null; }
+        public static Microsoft.Extensions.Caching.Memory.ICacheEntry SetValue(this Microsoft.Extensions.Caching.Memory.ICacheEntry entry, object? value) { throw null; }
     }
     public static partial class CacheExtensions
     {
diff --git a/src/libraries/Microsoft.Extensions.Caching.Abstractions/src/CacheEntryExtensions.cs b/src/libraries/Microsoft.Extensions.Caching.Abstractions/src/CacheEntryExtensions.cs
index 6cbafb5309683..e8c72b3ec37d9 100644
--- a/src/libraries/Microsoft.Extensions.Caching.Abstractions/src/CacheEntryExtensions.cs
+++ b/src/libraries/Microsoft.Extensions.Caching.Abstractions/src/CacheEntryExtensions.cs
@@ -126,7 +126,7 @@ public static ICacheEntry RegisterPostEvictionCallback(
         /// <returns>The <see cref="ICacheEntry"/> for chaining.</returns>
         public static ICacheEntry SetValue(
             this ICacheEntry entry,
-            object value)
+            object? value)
         {
             entry.Value = value;
             return entry;