diff --git a/llvm.spec b/llvm.spec
index 4255d3b..f6f4786 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -259,12 +259,12 @@ mv %{cmake_srcdir} cmake
 
 %build
 
-#ifarch s390 s390x
+%ifarch s390 s390x
 # Fails with "exceeded PCRE's backtracking limit"
 %global _lto_cflags %nil
-#else
-#global _lto_cflags -flto=thin
-#endif
+%else
+%global _lto_cflags -flto=thin
+%endif
 
 %ifarch s390 s390x %{arm} %ix86
 # Decrease debuginfo verbosity to reduce memory consumption during final library linking