diff --git a/rtems/config/4.11/rtems-avr.bset b/rtems/config/4.11/rtems-avr.bset
index c741c15..3ad25e2 100644
--- a/rtems/config/4.11/rtems-avr.bset
+++ b/rtems/config/4.11/rtems-avr.bset
@@ -32,8 +32,8 @@
 # Set the build flags to work around the defaults in the
 # compiler that cause ICE.
 #
-%define _targetcflags -g -O2
-%define _targetcxxflags -g -O2
+%define _targetcflags -g -O0
+%define _targetcxxflags -g -O0
 
 #
 # Tools configuration.