diff --git a/mono-core.spec b/mono-core.spec
index b3723ffa7a..d9ae95a6f3 100644
--- a/mono-core.spec
+++ b/mono-core.spec
@@ -21,7 +21,7 @@
 %else
 %{!?ext_man: %define ext_man .gz}
 %endif
-#%define llvm yes
+%define llvm yes
 %define sgen yes
 %undefine _missing_build_ids_terminate_build