diff --git a/src/include/ipc/header.h b/src/include/ipc/header.h
index 978e1d2080fc..d8d030f17216 100644
--- a/src/include/ipc/header.h
+++ b/src/include/ipc/header.h
@@ -331,6 +331,8 @@ struct ipc_cmd_hdr;
 /** Maximum message size for mailbox Tx/Rx */
 #if CONFIG_IPC_MAJOR_4
 #define SOF_IPC_MSG_MAX_SIZE			0x1000
+#elif CONFIG_LIBRARY_STATIC || UNIT_TEST
+#define SOF_IPC_MSG_MAX_SIZE			0x2000
 #else
 #define SOF_IPC_MSG_MAX_SIZE			384
 #endif