diff --git a/src/mrw/checkcxx11.hxx b/src/mrw/checkcxx11.hxx
index 5198e33..ca38fa7 100644
--- a/src/mrw/checkcxx11.hxx
+++ b/src/mrw/checkcxx11.hxx
@@ -28,7 +28,7 @@
 
 
 #  ifdef MRW__OLD_PRE11_COMPILER
-#    if __cplusplus < 200300L
+#    if __cplusplus <= 199711
 #      include <boost/shared_ptr.hpp>
 namespace std {
   // there is no std::shared_ptr in pre C++11 compilers, so we use the