diff --git a/makefile b/makefile
index 4740b3b..8fd4de0 100644
--- a/makefile
+++ b/makefile
@@ -44,10 +44,10 @@ deploy: site
 	ssh $(HOST) "sudo $(REMOTE_SCRIPT)"
 
 $(OUT_DIR)/%.html: $(ROOT_DIR)/%.html $(HTML_INCLUDES) $(BLOG_INDEX_LINKS) | $(OUT_DIR)
-	python ppp/ppp.py $< $(HTML_INCLUDES) $(BLOG_INDEX_LINKS) > $@
+	pipenv run python ppp/ppp.py $< $(HTML_INCLUDES) $(BLOG_INDEX_LINKS) > $@
 
 $(OUT_DIR)/%.css: $(ROOT_DIR)/%.css $(CSS_INCLUDES) | $(OUT_DIR)
-	python ppp/ppp.py $< $(CSS_INCLUDES) > $@
+	pipenv run python ppp/ppp.py $< $(CSS_INCLUDES) > $@
 
 $(OUT_DIR):
 	mkdir -p $@
@@ -61,7 +61,7 @@ $(BLOG_INDEX_LINKS): $(BLOG_TARGETS) | $(BLOG_TMP_DIR)
 	pipenv run python scripts/mkblogindex.py $(BLOG_TARGETS) > $@
 
 $(BLOG_OUT_DIR)/%.html: $(BLOG_OUT_DIR)/%.html.tmp $(HTML_INCLUDES) $(CSS_TARGETS)
-	python ppp/ppp.py $< $(HTML_INCLUDES) > $@
+	pipenv run python ppp/ppp.py $< $(HTML_INCLUDES) > $@
 	cp $(CSS_TARGETS) `dirname $@`
 	rm $<