diff --git a/chromium.spec b/chromium.spec
index 19ec6f97..e7a7e8da 100644
--- a/chromium.spec
+++ b/chromium.spec
@@ -6,8 +6,8 @@
 %endif
 
 # This flag is so I can build things very fast on a giant system.
-# Koji now likes this (as long as I don't build for every target at once).
-%global use_all_cpus 1
+# Enabling this in koji causes aarch64 builds to timeout indefinitely.
+%global use_all_cpus 0
 
 %if %{use_all_cpus}
 %global numjobs %{_smp_build_ncpus}