diff --git a/src/runboat/api.py b/src/runboat/api.py
index 794410e..925cbfa 100644
--- a/src/runboat/api.py
+++ b/src/runboat/api.py
@@ -174,11 +174,16 @@ async def delete(name: str) -> None:
 
 class BuildEventSource:
     def __init__(
-        self, request: Request, repo: str | None = None, build_name: str | None = None
+        self,
+        request: Request,
+        repo: str | None = None,
+        target_branch: str | None = None,
+        build_name: str | None = None,
     ):
         self.queue: asyncio.Queue[str] = asyncio.Queue()
         self.request = request
         self.repo = repo
+        self.target_branch = target_branch
         self.build_name = build_name
         controller.db.register_listener(self)
 
@@ -189,12 +194,16 @@ class BuildEventSource:
     def on_build_event(self, event: models.BuildEvent, build: models.Build) -> None:
         if self.repo and build.repo != self.repo:
             return
+        if self.target_branch and build.target_branch != self.target_branch:
+            return
         if self.build_name and build.name != self.build_name:
             return
         self.queue.put_nowait(self._serialize(event, build))
 
     async def events(self) -> AsyncGenerator[str, None]:
-        for build in controller.db.search(self.repo, self.build_name):
+        for build in controller.db.search(
+            self.repo, self.target_branch, self.build_name
+        ):
             yield self._serialize(models.BuildEvent.modified, build)
         while True:
             try:
@@ -212,7 +221,8 @@ class BuildEventSource:
 async def eventsource_endpoint(
     request: Request,
     repo: Optional[str] = None,
+    target_branch: Optional[str] = None,
     build_name: Optional[str] = None,
 ) -> EventSourceResponse:
-    event_source = BuildEventSource(request, repo, build_name)
+    event_source = BuildEventSource(request, repo, target_branch, build_name)
     return EventSourceResponse(event_source.events())
diff --git a/src/runboat/db.py b/src/runboat/db.py
index 249117f..f3db7c6 100644
--- a/src/runboat/db.py
+++ b/src/runboat/db.py
@@ -185,7 +185,10 @@ class BuildsDb:
         return [self._build_from_row(row) for row in rows]
 
     def search(
-        self, repo: str | None = None, name: str | None = None
+        self,
+        repo: str | None = None,
+        target_branch: str | None = None,
+        name: str | None = None,
     ) -> Iterator[Build]:
         query = "SELECT * FROM builds "
         where = []
@@ -193,6 +196,9 @@ class BuildsDb:
         if repo:
             where.append("repo=?")
             params.append(repo.lower())
+        if target_branch:
+            where.append("target_branch=?")
+            params.append(target_branch)
         if name:
             where.append("name=?")
             params.append(name)