diff --git a/tox.ini b/tox.ini
index d765893484..51a38732f1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,4 +6,4 @@ commands = {envpython} setup.py test
 setenv =
     TRYTOND_DATABASE_URI={env:POSTGIS_URI:postgis://}
     DB_NAME={env:POSTGIS_NAME:test}
-install_command = pip install --pre --find-links https://trydevpi.tryton.org/?local_version={env:CI_JOB_ID:{env:CI_BUILD_NUMBER}.{env:CI_JOB_NUMBER}} {opts} {packages}
+install_command = pip install --pre --find-links https://trydevpi.tryton.org/?local_version={env:CI_JOB_ID:{env:CI_BUILD_NUMBER:}.{env:CI_JOB_NUMBER:}} {opts} {packages}