diff --git a/kiss b/kiss
index cc75dc2..1739dce 100755
--- a/kiss
+++ b/kiss
@@ -799,14 +799,19 @@ pkg_swap() {
         # Convert the current owner to an alternative and rewrite
         # its manifest file to reflect this.
         cp  -Pf "$2" "$pkg_owns>${alt#*>}"
-        sed -i "$(esc "$2" "$PWD/$pkg_owns>${alt#*>}")" \
+        sed "$(esc "$2" "$PWD/$pkg_owns>${alt#*>}")" \
+            "../installed/$pkg_owns/manifest" > \
+            "../installed/$pkg_owns/manifest.tmp"
+        mv -f "../installed/$pkg_owns/manifest.tmp" \
             "../installed/$pkg_owns/manifest"
     fi
 
     # Convert the desired alternative to a real file and rewrite
     # the manifest file to reflect this. The reverse of above.
     mv  -f "$alt" "$2"
-    sed -i "$(esc "$PWD/$alt" "$2")" "../installed/$1/manifest"
+    sed "$(esc "$PWD/$alt" "$2")" "../installed/$1/manifest" > \
+        "../installed/$1/manifest.tmp"
+    mv -f "../installed/$1/manifest.tmp" "../installed/$1/manifest"
 }
 
 pkg_install_files() {