diff --git a/Makefile b/Makefile
index c80dc071..1589e2de 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,6 @@ all:
 	# make in subdirectory PSLab-apps-master if it is there
 	[ ! -d PSLab-apps-master ] || make -C PSLab-apps-master $@ DESTDIR=$(DESTDIR)
 	python setup.py build
-	python3 setup.py build
 
 clean:
 	rm -rf docs/_*
@@ -23,11 +22,8 @@ install:
 	install -d $(DESTDIR)/usr/share/doc/pslab
 	#cp -a docs/_build/html $(DESTDIR)/usr/share/doc/pslab
 	#cp docs/misc/build/*.html $(DESTDIR)/usr/share/doc/pslab/html
-	# create ditributions for Python2 and Python3
 	python setup.py install --install-layout=deb \
 	         --root=$(DESTDIR)/ --prefix=/usr
-	python3 setup.py install --install-layout=deb \
-	         --root=$(DESTDIR)/ --prefix=/usr
 	# rules for udev
 	mkdir -p $(DESTDIR)/lib/udev/rules.d
 	install -m 644 99-pslab.rules $(DESTDIR)/lib/udev/rules.d/99-pslab