diff --git a/config-x86-generic b/config-x86-generic
index f7df9a114..1d0840435 100644
--- a/config-x86-generic
+++ b/config-x86-generic
@@ -29,7 +29,7 @@ CONFIG_PNP=y
 
 CONFIG_MTRR=y
 CONFIG_MTRR_SANITIZER=y
-CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
+CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=0
 CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1
 CONFIG_X86_PAT=y
 CONFIG_X86_PM_TIMER=y
diff --git a/kernel.spec b/kernel.spec
index efd0e9d52..c014dc9d8 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -2288,6 +2288,9 @@ fi
 #                 ||----w |
 #                 ||     ||
 %changelog
+* Tue Jun 18 2013 Dave Jones <davej@redhat.com>
+- Disable MTRR sanitizer by default.
+
 * Tue Jun 18 2013 Justin M. Forbes <jforbes@redhat.com> - 3.10.0-0.rc6.git0.4
 - Testing the test harness