diff --git a/firefox.spec b/firefox.spec
index 75688d0..d078dd4 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -554,8 +554,9 @@ 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
-[ "$RPM_BUILD_NCPUS" -ge 4 ] && MOZ_SMP_FLAGS=-j4
-[ "$RPM_BUILD_NCPUS" -ge 8 ] && MOZ_SMP_FLAGS=-j8
+# 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
 %endif
 
 export MOZ_MAKE_FLAGS="$MOZ_SMP_FLAGS"