diff --git a/tools/install-headers.sh b/tools/install-headers.sh
index c851192f..324ce7ab 100755
--- a/tools/install-headers.sh
+++ b/tools/install-headers.sh
@@ -9,5 +9,5 @@ mkdir -p $LUNA_BASE
 mkdir -p $LUNA_BASE/usr/include
 mkdir -p $LUNA_BASE/usr/include/luna
 
-cp -RT libc/include/ $LUNA_BASE/usr/include
-cp -RT luna/include/luna/ $LUNA_BASE/usr/include/luna
+cp --preserve=timestamps -RT libc/include/ $LUNA_BASE/usr/include
+cp --preserve=timestamps -RT luna/include/luna/ $LUNA_BASE/usr/include/luna