diff --git a/makefiles/docker.inc.mk b/makefiles/docker.inc.mk
index cd2932966c53..d7249b5f5313 100644
--- a/makefiles/docker.inc.mk
+++ b/makefiles/docker.inc.mk
@@ -34,6 +34,7 @@ export DOCKER_ENV_VARS = \
   BINDIR \
   BINDIRBASE \
   BOARD \
+  BOARDS \
   BUILDRELPATH \
   BUILDTEST_MCU_GROUP \
   BUILDTEST_VERBOSE \