diff --git a/src/VORONOI/Install.sh b/src/VORONOI/Install.sh
index 0942ac6cfb..65578f2550 100755
--- a/src/VORONOI/Install.sh
+++ b/src/VORONOI/Install.sh
@@ -1,4 +1,33 @@
 # Install/unInstall package files in LAMMPS
+# mode = 0/1/2 for uninstall/install/update
+
+mode=$1
+
+# arg1 = file, arg2 = file it depends on
+
+action () {
+  if (test $mode = 0) then
+    rm -f ../$1
+  elif (! cmp -s $1 ../$1) then
+    if (test -z "$2" || test -e ../$2) then
+      cp $1 ..
+      if (test $mode = 2) then
+        echo "  updating src/$1"
+      fi
+    fi
+  elif (test ! -z "$2") then
+    if (test ! -e ../$2) then
+      rm -f ../$1
+    fi
+  fi
+}
+
+# all package files with no dependencies
+
+for file in *.cpp *.h; do
+  action $file
+done
+
 # edit 2 Makefile.package files to include/exclude package info
 
 if (test $1 = 1) then
@@ -18,9 +47,6 @@ include ..\/VORONOI\/Makefile.lammps
 ' ../Makefile.package.settings
   fi
 
-  cp compute_voronoi_atom.h ..
-  cp compute_voronoi_atom.cpp ..
-
 elif (test $1 = 0) then
 
   if (test -e ../Makefile.package) then
@@ -31,6 +57,4 @@ elif (test $1 = 0) then
     sed -i -e '/^include.*VORONOI.*$/d' ../Makefile.package.settings
   fi
 
-  rm -f ../compute_voronoi_atom.h
-  rm -f ../compute_voronoi_atom.cpp
 fi