diff --git a/tox.ini b/tox.ini
index 197496c0cb..1ba170c1e6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -12,4 +12,4 @@ setenv =
     postgresql: TRYTOND_DATABASE_URI={env:POSTGRESQL_URI:postgresql://}
     sqlite: DB_NAME={env:SQLITE_NAME::memory:}
     postgresql: DB_NAME={env:POSTGRESQL_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}