diff --git a/board/hammer/board.h b/board/hammer/board.h
index 5d3d191095..5ca814bc4c 100644
--- a/board/hammer/board.h
+++ b/board/hammer/board.h
@@ -231,6 +231,8 @@
 #define CONFIG_CHARGER_DISCHARGE_ON_AC
 #define CONFIG_CHARGER_OTG
 
+#define CONFIG_CHARGE_RAMP_HW
+
 #define CONFIG_BATTERY_CRITICAL_SHUTDOWN_CUT_OFF
 #define CONFIG_BATTERY_CUT_OFF
 #define CONFIG_BATTERY_SMART