diff --git a/glibc.changes b/glibc.changes
index 588fd09..c16d2f2 100644
--- a/glibc.changes
+++ b/glibc.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Jan  3 15:36:12 UTC 2012 - aj@suse.de
+
+- Only use -mno-tls-direct-seg-refs on 32-bit x86, it's not needed
+  on x86-64.
+
 -------------------------------------------------------------------
 Tue Jan  3 14:37:48 UTC 2012 - aj@suse.de
 
diff --git a/glibc.spec b/glibc.spec
index 6a44ac3..7d0b965 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -482,7 +482,8 @@ PARALLEL="%{?_smp_mflags}"
 %ifarch hppa
 	BuildFlags="$BuildFlags -mpa-risc-1-1 -fstrict-aliasing"
 %endif
-%ifarch %ix86 x86_64
+%ifarch %ix86
+# Add this to avoid performance penalty on Xen for 32-bit x86
 	BuildFlags="$BuildFlags -mno-tls-direct-seg-refs"
 %endif
 # Add flags for all plattforms except AXP