diff --git a/tests/generators/random/Makefile b/tests/generators/random/Makefile
index a3c845243..799001280 100644
--- a/tests/generators/random/Makefile
+++ b/tests/generators/random/Makefile
@@ -1,4 +1,5 @@
 all:
+	if ! test -d venv; then python3 -m venv venv; fi;
 	. ./venv/bin/activate
 	pip install -r requirements.txt
 	rm -f ../../core/pyspec/eth2spec/test/phase0/random/test_random.py