diff --git a/fslswapdim.cc b/fslswapdim.cc
index 8b504a09814b2344aa147acfff2b29328c1b5175..780b50f7c38eaabc12e6a29e51d6b0d9866ae15b 100644
--- a/fslswapdim.cc
+++ b/fslswapdim.cc
@@ -61,7 +61,7 @@ int fmrib_main(int argc,char *argv[])
     cout << "WARNING:: Flipping Left/Right orientation (as det < 0)" << endl;
   }
   
-  invol.swapdimensions(newx,newy,newz);
+  invol.swapdimensions(newx,newy,newz,true);
 
   int retval=0;
   if (outname!="") {