diff --git a/src/share/classes/sun/nio/cs/UTF_8.java b/src/share/classes/sun/nio/cs/UTF_8.java
index e54cffa5bb315bfd70ceff5722b898ed297dc3f3..b9221fe8cf661a2ee597c7f4aebddeb6a6aa9bc4 100644
--- a/src/share/classes/sun/nio/cs/UTF_8.java
+++ b/src/share/classes/sun/nio/cs/UTF_8.java
@@ -326,7 +326,7 @@ class UTF_8 extends Unicode
 
                         case 12: case 13:
                             // 6 bytes, 31 bits
-                            if (src.remaining() < 4)
+                            if (src.remaining() < 5)
                                 return CoderResult.UNDERFLOW;
                             if (!isContinuation(b2 = src.get()))
                                 return CoderResult.malformedForLength(1);