diff --git a/platform/cooja/dev/rs232.c b/platform/cooja/dev/rs232.c
index a52b9a130..51ee5b6a9 100644
--- a/platform/cooja/dev/rs232.c
+++ b/platform/cooja/dev/rs232.c
@@ -37,7 +37,7 @@
 
 const struct simInterface rs232_interface;
 
-#define SERIAL_BUF_SIZE 1024
+#define SERIAL_BUF_SIZE 2048
 
 // COOJA variables
 char simSerialReceivingData[SERIAL_BUF_SIZE];
diff --git a/tools/cooja/java/org/contikios/cooja/contikimote/interfaces/ContikiRS232.java b/tools/cooja/java/org/contikios/cooja/contikimote/interfaces/ContikiRS232.java
index 2607bc1ea..e8e7589e5 100644
--- a/tools/cooja/java/org/contikios/cooja/contikimote/interfaces/ContikiRS232.java
+++ b/tools/cooja/java/org/contikios/cooja/contikimote/interfaces/ContikiRS232.java
@@ -71,7 +71,7 @@ public class ContikiRS232 extends SerialUI implements ContikiMoteInterface, Poll
   private ContikiMote mote = null;
   private VarMemory moteMem = null;
 
-  static final int SERIAL_BUF_SIZE = 1024; /* rs232.c:40 */
+  static final int SERIAL_BUF_SIZE = 2048; /* rs232.c:40 */
   
   /**
    * Creates an interface to the RS232 at mote.