diff --git a/arx.cabal b/arx.cabal
--- a/arx.cabal
+++ b/arx.cabal
@@ -1,5 +1,5 @@
 name                          : arx
-version                       : 0.3.0
+version                       : 0.3.1
 category                      : Text
 license                       : BSD3
 license-file                  : LICENSE
diff --git a/model-scripts/tmpx.sh b/model-scripts/tmpx.sh
--- a/model-scripts/tmpx.sh
+++ b/model-scripts/tmpx.sh
@@ -72,7 +72,7 @@
   fi
   if $run
   then
-    ( . ../env && ../run "$@" )
+    ( . ../env && exec ../run "$@" )
   fi
 }
 unpack_env () { : # NOOP