diff --git a/tox.ini b/tox.ini
index 00cd535..c603c25 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,9 +5,7 @@ skipsdist = True
 
 [testenv]
 usedevelop = True
-install_command =
-                  constraints: {[testenv:common-constraints]install_command}
-                  pip install -U {opts} {packages}
+install_command = pip install -U {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/test-requirements.txt