diff --git a/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs b/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
index 67cde84c48389b..29118142d279fa 100644
--- a/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
+++ b/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
@@ -168,8 +168,8 @@ private static bool GetLinqExpressionsBuiltWithIsInterpretingOnly()
             return !(bool)typeof(LambdaExpression).GetMethod("get_CanCompileToIL").Invoke(null, Array.Empty<object>());
         }
 
-        // Drawing is not supported on non windows platforms in .NET 7.0+.
-        public static bool IsDrawingSupported => IsWindows && IsNotWindowsNanoServer && IsNotWindowsServerCore;
+        // Drawing is not supported on non windows platforms in .NET 7.0+ and on Mono.
+        public static bool IsDrawingSupported => IsWindows && IsNotWindowsNanoServer && IsNotWindowsServerCore && IsNotMonoRuntime;
 
         public static bool IsAsyncFileIOSupported => !IsBrowser && !IsWasi;
 
diff --git a/src/libraries/System.Formats.Nrbf/tests/ArraySinglePrimitiveRecordTests.cs b/src/libraries/System.Formats.Nrbf/tests/ArraySinglePrimitiveRecordTests.cs
index 49d523088a89fe..bea83b27211f80 100644
--- a/src/libraries/System.Formats.Nrbf/tests/ArraySinglePrimitiveRecordTests.cs
+++ b/src/libraries/System.Formats.Nrbf/tests/ArraySinglePrimitiveRecordTests.cs
@@ -19,7 +19,7 @@ public NonSeekableStream(byte[] buffer) : base(buffer) { }
 
     public static IEnumerable<object[]> GetCanReadArrayOfAnySizeArgs()
     {
-        foreach (int size in new[] { 1, 127, 128, 512_001, 512_001 })
+        foreach (int size in new[] { 1, 127, 128, 20_001 })
         {
             yield return new object[] { size, true };
             yield return new object[] { size, false };