diff --git a/archimedean.cpp b/archimedean.cpp
index 4b2dfb7e..5744c994 100644
--- a/archimedean.cpp
+++ b/archimedean.cpp
@@ -1109,7 +1109,12 @@ int readArgs() {
     shift(); load_symbol(args(), true);
     showstartmenu = false;
     }
-  else if(argis("-dual")) { PHASEFROM(2); set_variation(eVariation::dual); }
+  else if(argis("-dual")) {
+    PHASEFROM(2);
+    if(in())
+      set_variation(eVariation::dual);
+    else gp::dual_of_current();
+    }
   else if(argis("-d:arcm")) 
     launch_dialog(show);
   else return 1;
diff --git a/geom-exp.cpp b/geom-exp.cpp
index 62c35243..7a5202c4 100644
--- a/geom-exp.cpp
+++ b/geom-exp.cpp
@@ -1306,14 +1306,17 @@ int read_geom_args() {
     }
   else if(argis("-unrectified")) {
     PHASEFROM(2);
+    gp::param = gp::univ_param();
     set_variation(eVariation::unrectified);
     }
   else if(argis("-untruncated")) {
     PHASEFROM(2);
+    gp::param = gp::univ_param();
     set_variation(eVariation::untruncated);
     }
   else if(argis("-warped")) {
     PHASEFROM(2);
+    gp::param = gp::univ_param();
     set_variation(eVariation::warped);
     }
   #if MAXMDIM >= 4