diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 54e8c78c..1f342721 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -28,6 +28,9 @@
 # We define the following GitLab pipeline variables:
 variables:
 ##### LC GITLAB CONFIGURATION
+# Keep Proteus clones out of the default ~/.jacamar-ci/builds, which other
+# projects' CI jobs share and clean up.
+  CUSTOM_CI_BUILDS_DIR: "/usr/workspace/fink12/gitlab-runner-proteus"
 # Tells Gitlab to recursively update the submodules when cloning the project.
 #  GIT_SUBMODULE_STRATEGY: recursive
 
diff --git a/.gitlab/custom-jobs-and-variables.yml b/.gitlab/custom-jobs-and-variables.yml
index f1af44fd..22d59b59 100644
--- a/.gitlab/custom-jobs-and-variables.yml
+++ b/.gitlab/custom-jobs-and-variables.yml
@@ -86,9 +86,10 @@ variables:
   variables:
     JOB_TEMPLATE_CANNOT_BE_EMPTY: "True"
 
+# Remove only this job's clone; CI_BUILDS_DIR is shared with concurrent jobs.
 .remove-builds-dir:
   after_script:
-    - rm -rf ${CI_BUILDS_DIR}
+    - rm -rf ${CI_PROJECT_DIR}
 
 .clean-flux-allocation:
   after_script: