diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 15436eb..6c68a47 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -110,6 +110,7 @@ build/fedora/33:
   <<: *build
   variables:
     DOCKER_IMAGE: fedora/33
+    RPM_BUILD_NCPUS: '1'
 
 test/fedora/33:
   <<: *test