diff --git a/scripts/install.sh b/scripts/install.sh
index e9eb3d0..a2218dc 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -113,7 +113,8 @@ main() {
   local checksum_name
   local release_base
   local install_dir
-  local tmpdir
+  # tmpdir is intentionally not local so the EXIT trap can reference it after main returns.
+  tmpdir=""
   local archive_path
   local checksum_path
   local checksum_entry