diff --git a/firefox.spec b/firefox.spec
index 4ab6025..7ac7218 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -564,9 +564,8 @@ MOZ_SMP_FLAGS=-j1
 [ -z "$RPM_BUILD_NCPUS" ] && \
      RPM_BUILD_NCPUS="`/usr/bin/getconf _NPROCESSORS_ONLN`"
 [ "$RPM_BUILD_NCPUS" -ge 2 ] && MOZ_SMP_FLAGS=-j2
-# Temporary disabled to test koji build failures
-#[ "$RPM_BUILD_NCPUS" -ge 4 ] && MOZ_SMP_FLAGS=-j4
-#[ "$RPM_BUILD_NCPUS" -ge 8 ] && MOZ_SMP_FLAGS=-j8
+[ "$RPM_BUILD_NCPUS" -ge 4 ] && MOZ_SMP_FLAGS=-j4
+[ "$RPM_BUILD_NCPUS" -ge 8 ] && MOZ_SMP_FLAGS=-j8
 %endif
 
 export MOZ_MAKE_FLAGS="$MOZ_SMP_FLAGS"