diff --git a/Makefile b/Makefile
index 922e8b1..5f5166c 100644
--- a/Makefile
+++ b/Makefile
@@ -2,6 +2,9 @@ VENV_DIR ?= .venv
 POETRY ?= poetry
 POETRY_PYTHON ?= python
 
+# Any non-empty CI value (even 'false' or '0') means that CI is enabled
+CI ?=
+
 .PHONY: all init_env install clean lint format test
 
 -include .env
@@ -10,7 +13,7 @@ export
 all: build
 
 init_env:
-	$(POETRY) env use $(POETRY_PYTHON)
+	$(if $(CI),,$(POETRY) env use $(POETRY_PYTHON))
 
 install: init_env
 	$(POETRY) install