diff --git a/src/Compilers/CSharp/Portable/Parser/Lexer.cs b/src/Compilers/CSharp/Portable/Parser/Lexer.cs
index c7f270cbf813f..7a259a01aef45 100644
--- a/src/Compilers/CSharp/Portable/Parser/Lexer.cs
+++ b/src/Compilers/CSharp/Portable/Parser/Lexer.cs
@@ -3057,7 +3057,7 @@ private void ScanXmlEntity(ref TokenInfo info)
                 if (MatchesProductionForXmlChar(charValue))
                 {
                     char lowSurrogate;
-                    char highSurrogate = SlidingTextWindow.GetCharsFromUtf32(charValue, out lowSurrogate);
+                    char highSurrogate = GetCharsFromUtf32(charValue, out lowSurrogate);
 
                     _builder.Append(highSurrogate);
                     if (lowSurrogate != SlidingTextWindow.InvalidCharacter)
diff --git a/src/Compilers/CSharp/Portable/Parser/SlidingTextWindow.cs b/src/Compilers/CSharp/Portable/Parser/SlidingTextWindow.cs
index 6e39642976469..b84c4d55b8f57 100644
--- a/src/Compilers/CSharp/Portable/Parser/SlidingTextWindow.cs
+++ b/src/Compilers/CSharp/Portable/Parser/SlidingTextWindow.cs
@@ -481,21 +481,6 @@ public string GetText(int position, int length, bool intern)
             }
         }
 
-        internal static char GetCharsFromUtf32(uint codepoint, out char lowSurrogate)
-        {
-            if (codepoint < (uint)0x00010000)
-            {
-                lowSurrogate = InvalidCharacter;
-                return (char)codepoint;
-            }
-            else
-            {
-                Debug.Assert(codepoint > 0x0000FFFF && codepoint <= 0x0010FFFF);
-                lowSurrogate = (char)((codepoint - 0x00010000) % 0x0400 + 0xDC00);
-                return (char)((codepoint - 0x00010000) / 0x0400 + 0xD800);
-            }
-        }
-
         internal TestAccessor GetTestAccessor()
             => new TestAccessor(this);