diff --git a/src/mscorlib/shared/System/Globalization/CompareInfo.cs b/src/mscorlib/shared/System/Globalization/CompareInfo.cs
index 8dbfed1a834b..c369c816b03e 100644
--- a/src/mscorlib/shared/System/Globalization/CompareInfo.cs
+++ b/src/mscorlib/shared/System/Globalization/CompareInfo.cs
@@ -566,7 +566,7 @@ internal static unsafe int CompareOrdinalIgnoreCase(ReadOnlySpan<char> strA, Rea
                 char* b = bp;
 
                 // in InvariantMode we support all range and not only the ascii characters.
-                char maxChar = (char) (GlobalizationMode.Invariant ? 0xFFFF : 0x80);
+                char maxChar = (char) (GlobalizationMode.Invariant ? 0xFFFF : 0x7F);
 
                 while (length != 0 && (*a <= maxChar) && (*b <= maxChar))
                 {
diff --git a/src/mscorlib/src/System/String.Comparison.cs b/src/mscorlib/src/System/String.Comparison.cs
index 9bd907fecac1..44b3ed94b8f3 100644
--- a/src/mscorlib/src/System/String.Comparison.cs
+++ b/src/mscorlib/src/System/String.Comparison.cs
@@ -65,7 +65,7 @@ private unsafe static int CompareOrdinalIgnoreCaseHelper(String strA, String str
         [MethodImplAttribute(MethodImplOptions.InternalCall)]
         internal static extern int CompareOrdinalHelper(String strA, int indexA, int countA, String strB, int indexB, int countB);
 
-        //This will not work in case-insensitive mode for any character greater than 0x80.  
+        //This will not work in case-insensitive mode for any character greater than 0x7F.  
         //We'll throw an ArgumentException.
         [MethodImplAttribute(MethodImplOptions.InternalCall)]
         unsafe internal static extern int nativeCompareOrdinalIgnoreCaseWC(String strA, sbyte* strBBytes);