diff --git a/Makefile b/Makefile
index 691bf84c768aee6794420c467b0387390dec6218..514978035d9856f53f6cf695d5dc4534a9008054 100644
--- a/Makefile
+++ b/Makefile
@@ -54,6 +54,7 @@ lint: ## check style with flake8
 	flake8 flatland tests
 
 test: ## run tests quickly with the default Python
+	export DISPLAY=:0.0
 	py.test
 
 test-all: ## run tests on every Python version with tox