diff --git a/ports/atmel-samd/Makefile b/ports/atmel-samd/Makefile
index 25ab2c4aa7..65542354e6 100644
--- a/ports/atmel-samd/Makefile
+++ b/ports/atmel-samd/Makefile
@@ -361,7 +361,7 @@ OBJ += $(addprefix $(BUILD)/, $(SRC_S:.s=.o))
 OBJ += $(addprefix $(BUILD)/, $(SRC_MOD:.c=.o))
 
 SRC_QSTR += $(HEADER_BUILD)/sdiodata.h
-$(HEADER_BUILD)/sdiodata.h: $(TOP)/tools/mksdiodata.py | $(HEADER_BUILD)
+$(HEADER_BUILD)/sdiodata.h: tools/mksdiodata.py | $(HEADER_BUILD)
 	$(Q)$(PYTHON3) $< > $@
 
 SRC_QSTR += $(SRC_C) $(SRC_SUPERVISOR) $(SRC_COMMON_HAL_EXPANDED) $(SRC_SHARED_MODULE_EXPANDED)
diff --git a/tools/mksdiodata.py b/ports/atmel-samd/tools/mksdiodata.py
similarity index 100%
rename from tools/mksdiodata.py
rename to ports/atmel-samd/tools/mksdiodata.py