diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 410add1..e5010b8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -109,6 +109,7 @@ build/fedora/33:
   <<: *build
   variables:
     DOCKER_IMAGE: fedora/33
+    RPM_BUILD_NCPUS: '1'
 
 test/fedora/33:
   <<: *test