--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@
 	@yotta build
 
 $(MBIT_VER_FILE): FORCE
-	python tools/makeversionhdr.py $(MBIT_VER_FILE)
+	python3 tools/makeversionhdr.py $(MBIT_VER_FILE)
 
 $(VER_ADDR_FILE): yotta
 	@echo -n "0x" > $(VER_ADDR_FILE)
