Index: Serial.java
===================================================================
--- Serial.java	(revision 3870)
+++ Serial.java	(working copy)
@@ -228,7 +228,7 @@
             buffer[bufferLast++] = (byte) input.read();
             if (serialEventMethod != null) {
               if ((bufferUntil && (buffer[bufferLast-1] == bufferUntilByte)) ||
-                  ((bufferLast - bufferIndex) >= bufferSize)) {
+                  (!bufferUntil && ((bufferLast - bufferIndex) >= bufferSize))) {
                 try {
                   serialEventMethod.invoke(parent, new Object[] { this });
                 } catch (Exception e) {