diff --git a/src/eez/apps/psu/conf_advanced.h b/src/eez/apps/psu/conf_advanced.h
index 3ac639ea8..d9fbfc7b4 100644
--- a/src/eez/apps/psu/conf_advanced.h
+++ b/src/eez/apps/psu/conf_advanced.h
@@ -299,4 +299,4 @@
 #define CONF_DLOG_SYNC_FILE_TIME 10 // 10 seconds
 
 /// Size of serial port output buffer
-#define CONF_SERIAL_BUFFER_SIZE 512
+#define CONF_SERIAL_BUFFER_SIZE 1024