diff --git a/src/libraries/Common/src/System/HexConverter.cs b/src/libraries/Common/src/System/HexConverter.cs
index 0339a186f7c55d..71d7b4e8a7262e 100644
--- a/src/libraries/Common/src/System/HexConverter.cs
+++ b/src/libraries/Common/src/System/HexConverter.cs
@@ -145,12 +145,13 @@ private static void EncodeToUtf16_Vector128(ReadOnlySpan<byte> bytes, Span<char>
 
                 v0.StoreUnsafe(ref destRef, pos * 2);
 
-                pos += (nuint)Vector128<int>.Count;
-                if (pos == (nuint)bytes.Length)
+                if (pos == lengthSubVector128)
                 {
                     return;
                 }
 
+                pos += (nuint)Vector128<int>.Count;
+
                 // Overlap with the current chunk for trailing elements
                 if (pos > lengthSubVector128)
                 {