diff --git a/firefox.spec b/firefox.spec
index cfbd23a..3eefb70 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -667,7 +667,6 @@ MOZ_SMP_FLAGS=-j1
 [ "$RPM_BUILD_NCPUS" -ge 16 ] && MOZ_SMP_FLAGS=-j16
 [ "$RPM_BUILD_NCPUS" -ge 24 ] && MOZ_SMP_FLAGS=-j24
 [ "$RPM_BUILD_NCPUS" -ge 32 ] && MOZ_SMP_FLAGS=-j32
-[ "$RPM_BUILD_NCPUS" -ge 64 ] && MOZ_SMP_FLAGS=-j64
 %endif
 
 echo "mk_add_options MOZ_MAKE_FLAGS=\"$MOZ_SMP_FLAGS\"" >> .mozconfig