diff --git a/jikes.spec b/jikes.spec
index 08819d5..e36e3bb 100644
--- a/jikes.spec
+++ b/jikes.spec
@@ -16,6 +16,7 @@
 #
 
 
+%{!?make_build:%global make_build make %{?_smp_mflags}}
 Name:           jikes
 Version:        1.22
 Release:        0