diff --git a/application/tom_modem/src/modem_types.h b/application/tom_modem/src/modem_types.h
index 19463ff..71a4d7c 100644
--- a/application/tom_modem/src/modem_types.h
+++ b/application/tom_modem/src/modem_types.h
@@ -50,7 +50,7 @@
 #define SMS_BUF_SIZE 16384
 #define LINE_BUF 1024
 #define SMS_LIST_SIZE 128
-#define COMMON_BUF_SIZE 1024
+#define COMMON_BUF_SIZE 16384
 #define PHONE_NUMBER_SIZE 64
 #define SMS_TEXT_SIZE 256
 #define SMS_PDU_STR_SIZE 512