diff --git a/src/mrw/checkcxx11.hxx b/src/mrw/checkcxx11.hxx
index 2cbaa70..7c04581 100644
--- a/src/mrw/checkcxx11.hxx
+++ b/src/mrw/checkcxx11.hxx
@@ -30,6 +30,9 @@
 // __cplusplus==1 is a known bug in gcc 4.6.3
 #    warning your compiler has a know bug, please upgrade to gcc >= 4.7
 #    warning see __cplusplus in http://gcc.gnu.org/gcc-4.7/changes.html
+#    ifdef __linux__
+#      undef MRW__OLD_PRE11_COMPILER
+#    endif
 #  endif