diff --git a/pkgs/tools/archivers/undmg/setup-hook.sh b/pkgs/tools/archivers/undmg/setup-hook.sh
index e5c8dda23b6a..bc7ed76107ef 100644
--- a/pkgs/tools/archivers/undmg/setup-hook.sh
+++ b/pkgs/tools/archivers/undmg/setup-hook.sh
@@ -1,5 +1,5 @@
 unpackCmdHooks+=(_tryUnpackDmg)
 _tryUnpackDmg() {
     if ! [[ "$curSrc" =~ \.dmg$ ]]; then return 1; fi
-    undmg < "$curSrc"
+    undmg "$curSrc"
 }