diff --git a/CHANGE_LOG.txt b/CHANGE_LOG.txt
index 38e3307..b405073 100644
--- a/CHANGE_LOG.txt
+++ b/CHANGE_LOG.txt
@@ -12,7 +12,7 @@ Changes:
 - improved correctness of timer when reconfiguring CPU clock speed (MCLK)
 - improved interrupt handling in MSP430 core
 - added CLI command printcalls that prints all function calls
-
+- fixed buffering of serial input in GUI to avoid freezing AWT. 
 
 0.93
 Changes:
diff --git a/se/sics/mspsim/chip/SHT11.java b/se/sics/mspsim/chip/SHT11.java
index 688ac4d..9c71dfd 100644
--- a/se/sics/mspsim/chip/SHT11.java
+++ b/se/sics/mspsim/chip/SHT11.java
@@ -206,14 +206,14 @@ public class SHT11 extends Chip {
         if (bitCnt == 8) {
           // All bits are written!
           state = ACK_WRITE;
-          System.out.println("Wrote byte: " + output[writePos]);
+          if (DEBUG) System.out.println("Wrote byte: " + output[writePos]);
           writePos++;
         }
       }
       break;
     case ACK_WRITE:
       if (c == 'C' && dataHi) {
-        System.out.println("*** NO ACK???");
+        if (DEBUG) System.out.println("*** NO ACK???");
         reset(0);
       }
       break;
@@ -233,7 +233,7 @@ public class SHT11 extends Chip {
       break;
     case ACK_WRITE:
       if (c == 'D') { // if D goes back high - then we are done here!!!
-        System.out.println("ACK for byte complete...");
+        if (DEBUG) System.out.println("ACK for byte complete...");
         if (writePos < writeLen) {
           state = WRITE_BYTE;
           writeData = output[writePos];