diff --git a/src/libraries/System.Private.CoreLib/src/System/Text/Unicode/Utf16Utility.Validation.cs b/src/libraries/System.Private.CoreLib/src/System/Text/Unicode/Utf16Utility.Validation.cs
index f2df0ccdf53c42..2600dff49a3dac 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Text/Unicode/Utf16Utility.Validation.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Text/Unicode/Utf16Utility.Validation.cs
@@ -79,7 +79,11 @@ static Utf16Utility()
             long tempUtf8CodeUnitCountAdjustment = 0;
             int tempScalarCountAdjustment = 0;
 
-            if ((AdvSimd.Arm64.IsSupported && BitConverter.IsLittleEndian) || Sse2.IsSupported)
+            // Per https://github.com/dotnet/runtime/issues/41699, temporarily disabling
+            // ARM64-intrinsicified code paths. ARM64 platforms may still use the vectorized
+            // non-intrinsicified 'else' block below.
+
+            if (/* (AdvSimd.Arm64.IsSupported && BitConverter.IsLittleEndian) || */ Sse2.IsSupported)
             {
                 if (inputLength >= Vector128<ushort>.Count)
                 {