diff --git a/Makefile b/Makefile
index f21f9b908493a2881ee5c8d2aa4537e9fb059d49..cab89b128cdac83bc705f7388f288ec10e754b46 100644
--- a/Makefile
+++ b/Makefile
@@ -59,6 +59,9 @@ endif
 
 ifneq ($(findstring sharp96,${drivers}), )
 	CXX_TARGETS += src/driver/sharp96.cc
+	sharp96_power_pin ?= p4_2
+	sharp96_en_pin ?= p4_3
+	sharp96_cs_pin ?= p2_4
 	COMMON_FLAGS += -DDRIVER_SHARP6
 	COMMON_FLAGS += -DSHARP96_POWER_PIN=GPIO::${sharp96_power_pin}
 	COMMON_FLAGS += -DSHARP96_EN_PIN=GPIO::${sharp96_en_pin}