diff --git a/ci.py b/ci.py
index 6b0fd59..a3d8db0 100644
--- a/ci.py
+++ b/ci.py
@@ -481,7 +481,7 @@ def open_pr(args):
     if push.returncode != 0:
         raise RuntimeError(f"git push failed:\n{push.stderr}")
 
-    pulls = gitea("GET", "/pulls?state=open")
+    pulls = gitea("GET", f"/pulls?state=open&base_branch={args.base}")
     existing = next((pr for pr in pulls if pr["head"]["ref"] == args.branch), None)
     if existing:
         print(f"PR #{existing['number']} already open, pushed update")