1 files changed, 3 insertions, 3 deletions
diff --git a/src/main/javassist/util/proxy/RuntimeSupport.java b/src/main/javassist/util/proxy/RuntimeSupport.java
index 0bd0cce9..9eb1c49e 100644
--- a/src/main/javassist/util/proxy/RuntimeSupport.java
+++ b/src/main/javassist/util/proxy/RuntimeSupport.java
@@ -198,7 +198,7 @@ public class RuntimeSupport {
      * @param retType   return type.
      */
     public static String makeDescriptor(Class<?>[] params, Class<?> retType) {
-        StringBuffer sbuf = new StringBuffer();
+        StringBuilder sbuf = new StringBuilder();
         sbuf.append('(');
         for (int i = 0; i < params.length; i++)
             makeDesc(sbuf, params[i]);
@@ -217,12 +217,12 @@ public class RuntimeSupport {
      * @param retType   return type.
      */
     public static String makeDescriptor(String params, Class<?> retType) {
-        StringBuffer sbuf = new StringBuffer(params);
+        StringBuilder sbuf = new StringBuilder(params);
         makeDesc(sbuf, retType);
         return sbuf.toString();
     }
 
-    private static void makeDesc(StringBuffer sbuf, Class<?> type) {
+    private static void makeDesc(StringBuilder sbuf, Class<?> type) {
         if (type.isArray()) {
             sbuf.append('[');
             makeDesc(sbuf, type.getComponentType());