diff --git a/fslorient.cc b/fslorient.cc
index ec597db0df43c3992997a90f18cf118367224920..a474726cdc4935e5eb7fe918c8aaf6f93012925f 100644
--- a/fslorient.cc
+++ b/fslorient.cc
@@ -7,7 +7,9 @@
 /*  CCOPYRIGHT  */
 
 
-#define EXPOSE_TREACHEROUS 1
+#ifndef EXPOSE_TREACHEROUS
+#define EXPOSE_TREACHEROUS
+#endif
 
 #include "newimage/newimageall.h"
 #include "newimage/fmribmain.h"