diff --git a/encfs/shared_ptr.h b/encfs/shared_ptr.h
index 068a70f..e652859 100644
--- a/encfs/shared_ptr.h
+++ b/encfs/shared_ptr.h
@@ -22,8 +22,16 @@
 #ifndef _SHARED_PTR_incl_
 #define _SHARED_PTR_incl_
 
+#include "config.h"
+
+#ifdef HAVE_TR1_MEMORY
+#include <tr1/memory>
+using std::tr1::shared_ptr;
+using std::tr1::dynamic_pointer_cast;
+#else
 #include <memory>
 using std::shared_ptr;
 using std::dynamic_pointer_cast;
+#endif
 
 #endif