diff --git a/Makefile.in b/Makefile.in
index 87f1c8be..aff2b339 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -60,14 +60,14 @@ include $(SRC)/make/rules-cargo.mk
 CCACHE_ENV := $(patsubst %,-e %,$(shell env|cut -d= -f1|grep '^CCACHE_'))
 ifeq ($(ENABLE_CCACHE),1)
 	export CCACHE_DIR := $(if $(CCACHE_DIR),$(CCACHE_DIR),$(HOME)/.ccache)
-	DOCKER_OPTS := -v $(CCACHE_DIR):$(CCACHE_DIR)$(CONTAINER_MOUNT_OPTS) $(CCACHE_ENV) -e CCACHE_DIR=$(CCACHE_DIR) $(DOCKER_OPTS)
+	override DOCKER_OPTS := -v $(CCACHE_DIR):$(CCACHE_DIR)$(CONTAINER_MOUNT_OPTS) $(CCACHE_ENV) -e CCACHE_DIR=$(CCACHE_DIR) $(DOCKER_OPTS)
 else
 	export CCACHE_DISABLE := 1
-	DOCKER_OPTS := $(CCACHE_ENV) -e CCACHE_DISABLE=1 $(DOCKER_OPTS)
+	override DOCKER_OPTS := $(CCACHE_ENV) -e CCACHE_DISABLE=1 $(DOCKER_OPTS)
 endif
 
 ifneq ($(ROOTLESS_CONTAINER),1)
-	DOCKER_OPTS := -e HOME -e USER -e USERID=$(shell id -u) -u $(shell id -u):$(shell id -g) $(DOCKER_OPTS)
+	override DOCKER_OPTS := -e HOME -e USER -e USERID=$(shell id -u) -u $(shell id -u):$(shell id -g) $(DOCKER_OPTS)
 endif
 
 ifeq ($(CONTAINER_ENGINE),)