diff --git a/Makefile.am b/Makefile.am
index 0352bfd..dc8e9f7 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -18,10 +18,10 @@ _trial_temp/coverage: $(top_srcdir)/morituri/*.py $(top_srcdir)/morituri/*/*.py
 	trial --coverage morituri.test
 
 coverage: _trial_temp/coverage
-	python misc/show-coverage.py `ls _trial_temp/coverage/morituri* | grep -v morituri.test | grep -v morituri.extern`
+	$(PYTHON) misc/show-coverage.py `ls _trial_temp/coverage/morituri* | grep -v morituri.test | grep -v morituri.extern`
 
 pep8:
-	for file in $(SOURCES); do python misc/pep8.py --repeat $$file; done
+	for file in $(SOURCES); do $(PYTHON) misc/pep8.py --repeat $$file; done
 
 clean-local:
 	@rm -rf _trial_temp
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 818a0a8..c115c2c 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -24,7 +24,7 @@ morituri.ics: $(top_srcdir)/morituri.doap
 man_MANS = rip.1
 
 rip.1: $(top_srcdir)/morituri/extern/python-command/scripts/help2man $(top_srcdir)/morituri
-	PYTHONPATH=$(top_srcdir) python $(top_srcdir)/morituri/extern/python-command/scripts/help2man morituri.rip.main.Rip rip > rip.1
+	PYTHONPATH=$(top_srcdir) $(PYTHON) $(top_srcdir)/morituri/extern/python-command/scripts/help2man morituri.rip.main.Rip rip > rip.1
 
 clean-local:
 	@rm -rf reference