diff --git a/src/prod/src/managed/Api/src/System/Fabric/OperationData.cs b/src/prod/src/managed/Api/src/System/Fabric/OperationData.cs
index 41f7ac5b2..44b673362 100644
--- a/src/prod/src/managed/Api/src/System/Fabric/OperationData.cs
+++ b/src/prod/src/managed/Api/src/System/Fabric/OperationData.cs
@@ -106,7 +106,7 @@ internal static OperationData CreateFromNative(uint count, IntPtr buffer)
 
         private static unsafe IList<ArraySegment<byte>> CreateFromNativeInternal(uint count, IntPtr buffer)
         {
-            List<ArraySegment<byte>> returnValue = new List<ArraySegment<byte>>();
+            List<ArraySegment<byte>> returnValue = new List<ArraySegment<byte>>(count);
 
             for (int i = 0; i < count; i++)
             {
@@ -117,4 +117,4 @@ private static unsafe IList<ArraySegment<byte>> CreateFromNativeInternal(uint co
             return returnValue.AsReadOnly();
         }
     }
-}
\ No newline at end of file
+}