diff --git a/firmware/hw_layer/ports/rusefi_halconf.h b/firmware/hw_layer/ports/rusefi_halconf.h
index fddcb54695..81689e459a 100644
--- a/firmware/hw_layer/ports/rusefi_halconf.h
+++ b/firmware/hw_layer/ports/rusefi_halconf.h
@@ -180,7 +180,7 @@
 #endif
 
 #ifndef SERIAL_USB_BUFFERS_TX_SIZE
-#define SERIAL_USB_BUFFERS_TX_SIZE     1024
+#define SERIAL_USB_BUFFERS_TX_SIZE     512
 #endif
 
 #ifndef SERIAL_USB_BUFFERS_TX_NUMBER