diff --git a/scripts/wire-local-setup.bash b/scripts/wire-local-setup.bash
index b6ed055..f737af2 100755
--- a/scripts/wire-local-setup.bash
+++ b/scripts/wire-local-setup.bash
@@ -476,7 +476,13 @@ do
 done
 
 echo "wire-protobuf-bundler,protoc-gen-solana,protoc-gen-solidity are on the PATH"
-./scripts/generate-opp-bundles.fish
+# wire-sysio renamed the bundle generator .fish -> .sh; support both so older
+# branches keep building.
+if [ -x ./scripts/generate-opp-bundles.sh ]; then
+  ./scripts/generate-opp-bundles.sh
+else
+  ./scripts/generate-opp-bundles.fish
+fi
 popd
 
 log "wire-sysio: CMake configure & build"