diff --git a/cli b/cli
index 3dc3e83..7f886f4 100755
--- a/cli
+++ b/cli
@@ -22,8 +22,10 @@ fi
 
 case $EMIT in
   "uxn")
-  ./out/$ARCH/undar -emit=uxn $1 > ./out/tmp.tal
-  $(which uxncli) $HOME/roms/uxn/drifblim.rom ./out/tmp.tal ./out/$1.rom 2> /dev/null
+	  if [ ! -f "./out/$1.rom" ]; then
+        ./out/$ARCH/undar -emit=uxn $1 > ./out/tmp.tal
+        $(which uxncli) $HOME/roms/uxn/drifblim.rom ./out/tmp.tal ./out/$1.rom 2> /dev/null
+      fi
   $(which uxncli) ./out/$1.rom
   ;;
 esac
diff --git a/gui b/gui
index 756095f..40b5735 100755
--- a/gui
+++ b/gui
@@ -22,8 +22,10 @@ fi
 
 case $EMIT in
   "uxn")
-  ./out/$ARCH/undar -emit=uxn $1 > ./out/tmp.tal
-  $(which uxncli) $HOME/roms/uxn/drifblim.rom ./out/tmp.tal ./out/$1.rom 2> /dev/null
+	  if [ ! -f "./out/$1.rom" ]; then
+        ./out/$ARCH/undar -emit=uxn $1 > ./out/tmp.tal
+        $(which uxncli) $HOME/roms/uxn/drifblim.rom ./out/tmp.tal ./out/$1.rom 2> /dev/null
+      fi
   $(which uxn11) ./out/$1.rom
   ;;
 esac