diff --git a/Makefile.docker b/Makefile.docker
index 725656d482e8af84a9483f1f1091647d6e5619cd..0004ab2b2c2aba40fb2161e12f0fb750029d9e78 100644
--- a/Makefile.docker
+++ b/Makefile.docker
@@ -46,6 +46,7 @@ export DOCKER_ENV_VARS = \
   LINK \
   LINKFLAGPREFIX \
   LINKFLAGS \
+  LTO \
   OBJCOPY \
   OFLAGS \
   PREFIX \