diff --git a/Makefile b/Makefile
index 7399eb3a..646b7e30 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ test: .venv.touch
 	tox $(REBUILD_FLAG)
 
 
-.venv.touch: setup.py requirements.txt requirements_dev.txt
+.venv.touch: setup.py requirements.txt requirements-dev.txt
 	$(eval REBUILD_FLAG := --recreate)
 	touch .venv.touch
 
diff --git a/requirements_dev.txt b/requirements-dev.txt
similarity index 100%
rename from requirements_dev.txt
rename to requirements-dev.txt
diff --git a/tox.ini b/tox.ini
index bcefac30..ca14ff82 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,7 +5,7 @@ envlist = py26,py27,py33,py34,pypy
 
 [testenv]
 install_command = pip install --use-wheel {opts} {packages}
-deps = -rrequirements_dev.txt
+deps = -rrequirements-dev.txt
 commands =
     coverage erase
     coverage run -m pytest {posargs:tests}