diff --git a/src/ICU4N/Impl/Normalizer2Impl.cs b/src/ICU4N/Impl/Normalizer2Impl.cs
index 5fb15f5df..f05a2984c 100644
--- a/src/ICU4N/Impl/Normalizer2Impl.cs
+++ b/src/ICU4N/Impl/Normalizer2Impl.cs
@@ -83,7 +83,7 @@ public static bool IsJamo(int c)
     public sealed partial class ReorderingBuffer : IAppendable
     {
         public ReorderingBuffer(Normalizer2Impl ni, StringBuilder dest, int destCapacity)
-            : this(ni, dest.ToAppendable(), destCapacity)
+            : this(ni, dest.AsAppendable(), destCapacity)
         {
         }
 
diff --git a/src/ICU4N/Support/Text/StringBuilderExtensions.cs b/src/ICU4N/Support/Text/StringBuilderExtensions.cs
index 630a95a54..3cc03e333 100644
--- a/src/ICU4N/Support/Text/StringBuilderExtensions.cs
+++ b/src/ICU4N/Support/Text/StringBuilderExtensions.cs
@@ -15,7 +15,7 @@ internal static class StringBuilderExtensions
         /// </summary>
         /// <param name="text">This <see cref="StringBuilder"/>.</param>
         /// <returns>An <see cref="StringBuilderCharSequence"/>.</returns>
-        internal static IAppendable ToAppendable(this StringBuilder text)
+        internal static IAppendable AsAppendable(this StringBuilder text)
         {
             return new StringBuilderCharSequence(text);
         }
diff --git a/src/ICU4N/Text/MessageFormat.cs b/src/ICU4N/Text/MessageFormat.cs
index 0974327b1..2b6b534c8 100644
--- a/src/ICU4N/Text/MessageFormat.cs
+++ b/src/ICU4N/Text/MessageFormat.cs
@@ -2933,7 +2933,7 @@ internal sealed class AppendableWrapper
         {
             public AppendableWrapper(StringBuilder sb)
             {
-                app = sb.ToAppendable();
+                app = sb.AsAppendable();
                 length = sb.Length;
                 attributes = null;
             }
diff --git a/src/ICU4N/Text/UnicodeSet.cs b/src/ICU4N/Text/UnicodeSet.cs
index 2189c9366..d007b072b 100644
--- a/src/ICU4N/Text/UnicodeSet.cs
+++ b/src/ICU4N/Text/UnicodeSet.cs
@@ -2378,7 +2378,7 @@ public virtual UnicodeSet ApplyPattern(string pattern,
             StringBuilder rebuiltPat = new StringBuilder();
             RuleCharacterIterator chars =
                     new RuleCharacterIterator(pattern, symbols, pos);
-            ApplyPattern(chars, symbols, rebuiltPat.ToAppendable(), options);
+            ApplyPattern(chars, symbols, rebuiltPat.AsAppendable(), options);
             if (chars.InVariable)
             {
                 SyntaxError(chars, "Extra chars in variable value");
@@ -2598,11 +2598,11 @@ private void ApplyPattern(RuleCharacterIterator chars, ISymbolTable symbols,
                     switch (setMode)
                     {
                         case SETMODE1_UNICODESET:
-                            nested.ApplyPattern(chars, symbols, patBuf.ToAppendable(), options);
+                            nested.ApplyPattern(chars, symbols, patBuf.AsAppendable(), options);
                             break;
                         case SETMODE2_PROPERTYPAT:
                             chars.SkipIgnored(opts);
-                            nested.ApplyPropertyPattern(chars, patBuf.ToAppendable(), symbols);
+                            nested.ApplyPropertyPattern(chars, patBuf.AsAppendable(), symbols);
                             break;
                         case SETMODE3_PREPARSED: // `nested' already parsed
                             nested.ToPattern(patBuf, false);