diff --git a/Makefile b/Makefile
index 48680a8..d9a0555 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ VOLUME_LOCAL := -v $(PWD):$(PWD)
 VOLUME_CI := --volumes-from=$(JOB_CONTAINER_NAME)
 
 ifeq "$(CI)" "true"
-    VOLUME := VOLUME_CI
+    VOLUME := $(VOLUME_CI)
     $(info Running in a CI environment)
 else ifneq "$(DOCKER_IS_ROOTLESS)" "1"
     # Rooted Docker requires this flag so that the files it creates are