diff --git a/guix/self.scm b/guix/self.scm
index 87d00ea64f..2cfdc41200 100644
--- a/guix/self.scm
+++ b/guix/self.scm
@@ -410,7 +410,10 @@ a list of extra files, such as '(\"contributing\")."
             ;; Limit thread creation by 'n-par-for-each'.  Going beyond can
             ;; lead libgc 8.0.4 to abort with:
             ;; mmap(PROT_NONE) failed
-            (min (parallel-job-count) 4))
+            ;;
+            ;; FIXME: The above error would still happen when using only 4
+            ;; build jobs, so disable parallelism entirely for the time being.
+            (min (parallel-job-count) 1))
 
           (mkdir #$output)
           (copy-recursively #$documentation "."