diff --git a/src/libraries/System.IO.Compression/tests/Zstandard/CompressionStreamUnitTests.Zstandard.cs b/src/libraries/System.IO.Compression/tests/Zstandard/CompressionStreamUnitTests.Zstandard.cs
index 9c6c77f4f0b714..109574db7ef22c 100644
--- a/src/libraries/System.IO.Compression/tests/Zstandard/CompressionStreamUnitTests.Zstandard.cs
+++ b/src/libraries/System.IO.Compression/tests/Zstandard/CompressionStreamUnitTests.Zstandard.cs
@@ -17,11 +17,11 @@ public class ZstandardStreamUnitTests : CompressionStreamUnitTestBase
         public override Stream CreateStream(Stream stream, CompressionMode mode, bool leaveOpen) => new ZstandardStream(stream, mode, leaveOpen);
         public override Stream CreateStream(Stream stream, CompressionLevel level)
         {
-            if (PlatformDetection.Is32BitProcess && level == CompressionLevel.SmallestSize)
+            if ((PlatformDetection.Is32BitProcess || PlatformDetection.IsAppleMobile) && level == CompressionLevel.SmallestSize)
             {
                 // Zstandard smallest size requires too much working memory
                 // (800+ MB) and causes intermittent allocation errors on 32-bit
-                // processes in CI.
+                // processes and on memory-constrained Apple mobile devices (iOS/tvOS/MacCatalyst) in CI.
                 level = CompressionLevel.Optimal;
             }
 
@@ -29,11 +29,11 @@ public override Stream CreateStream(Stream stream, CompressionLevel level)
         }
         public override Stream CreateStream(Stream stream, CompressionLevel level, bool leaveOpen)
         {
-            if (PlatformDetection.Is32BitProcess && level == CompressionLevel.SmallestSize)
+            if ((PlatformDetection.Is32BitProcess || PlatformDetection.IsAppleMobile) && level == CompressionLevel.SmallestSize)
             {
                 // Zstandard smallest size requires too much working memory
                 // (800+ MB) and causes intermittent allocation errors on 32-bit
-                // processes in CI.
+                // processes and on memory-constrained Apple mobile devices (iOS/tvOS/MacCatalyst) in CI.
                 level = CompressionLevel.Optimal;
             }