diff --git a/jdk/src/share/classes/sun/nio/cs/UTF_8.java b/jdk/src/share/classes/sun/nio/cs/UTF_8.java
index 2b62e92f6c1..ae2d09b8c08 100644
--- a/jdk/src/share/classes/sun/nio/cs/UTF_8.java
+++ b/jdk/src/share/classes/sun/nio/cs/UTF_8.java
@@ -358,7 +358,7 @@ class UTF_8 extends Unicode
     private static class Encoder extends CharsetEncoder {
 
         private Encoder(Charset cs) {
-            super(cs, 1.1f, 4.0f);
+            super(cs, 1.1f, 3.0f);
         }
 
         public boolean canEncode(char c) {