diff --git a/src/smpp34_structs.h b/src/smpp34_structs.h
index 6b9f41e..71d22cd 100644
--- a/src/smpp34_structs.h
+++ b/src/smpp34_structs.h
@@ -23,7 +23,7 @@
 #ifndef _STB_H_
 #define _STB_H_
 
-#define SMALL_BUFF      30
+#define SMALL_BUFF      34
 /* Identify PDUs ident ********************************************************/
 #define MAX_TLV_SIZE         1024
 #define MAX_DAD_SIZE         21