diff --git a/llvm.spec b/llvm.spec
index 3498a35..00ca698 100644
--- a/llvm.spec
+++ b/llvm.spec
@@ -67,7 +67,7 @@
 
 Name:		%{pkg_name}
 Version:	%{maj_ver}.%{min_ver}.%{patch_ver}%{?rc_ver:~rc%{rc_ver}}
-Release:	5%{?dist}
+Release:	6%{?dist}
 Summary:	The Low Level Virtual Machine
 
 License:	NCSA
@@ -207,15 +207,13 @@ LLVM's modified googletest sources.
 
 %build
 
-# Disable LTO on s390x, this causes some test failures:
-# LLVM-Unit :: Target/AArch64/./AArch64Tests/InstSizes.Authenticated
-# LLVM-Unit :: Target/AArch64/./AArch64Tests/InstSizes.PATCHPOINT
-# LLVM-Unit :: Target/AArch64/./AArch64Tests/InstSizes.STACKMAP
-# LLVM-Unit :: Target/AArch64/./AArch64Tests/InstSizes.TLSDESC_CALLSEQ
-# On X86_64, LTO builds of TableGen crash.  This can be reproduced by:
-# %%cmake_build --target include/llvm/IR/IntrinsicsAArch64.h
-# Because of these failures, lto is disabled for now.
+# Disable lto on s390x due to https://bugzilla.redhat.com/show_bug.cgi?id=2017193
+# Disable lto on arm due to https://bugzilla.redhat.com/show_bug.cgi?id=1918924
+%ifarch s390x %{arm}
 %global _lto_cflags %{nil}
+%else
+%global _lto_cflags -flto=thin
+%endif
 
 %ifarch s390 s390x %{arm} %ix86
 # Decrease debuginfo verbosity to reduce memory consumption during final library linking
@@ -549,6 +547,9 @@ fi
 %endif
 
 %changelog
+* Mon Oct 25 2021 Tom Stellard <tstellar@redhat.com> - 13.0.0-6
+- Build with Thin LTO
+
 * Mon Oct 18 2021 Tom Stellard <tstellar@redhat.com> - 13.0.0-5
 - Build with clang