diff --git a/.drone.star b/.drone.star
index 61c8f712..cfcd1408 100644
--- a/.drone.star
+++ b/.drone.star
@@ -8,7 +8,7 @@
 # As the yaml syntax for Drone CI is rather limited.
 #
 #
-globalenv={'B2_VARIANT': 'variant=release,debug'}
+globalenv={'B2_CI_VERSION': '0', 'B2_VARIANT': 'variant=release,debug'}
 linuxglobalimage="cppalliance/droneubuntu1604:1"
 windowsglobalimage="cppalliance/dronevs2019"
 
diff --git a/appveyor.yml b/appveyor.yml
index 9c5b1d81..cdcc47ae 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -47,6 +47,7 @@ environment:
     # B2_LINK: link=shared,static
     # B2_THREADING: threading=multi,single
     B2_VARIANT: variant=release,debug
+    B2_CI_VERSION: 0
 
   matrix:
     - FLAVOR: Visual Studio 2017 C++2a Strict