diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 929e140..3991f5a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,7 +1,7 @@
 name: Build
 
-# Trigger on push or via manual dispatch.
-on: [push, workflow_dispatch]
+# Trigger on push, pull request, or via manual dispatch.
+on: [push, pull_request, workflow_dispatch]
 
 jobs:
   build:
diff --git a/gemma.cc b/gemma.cc
index 2a51b34..70777ac 100644
--- a/gemma.cc
+++ b/gemma.cc
@@ -60,7 +60,8 @@
 #include "hwy/aligned_allocator.h"
 #include "hwy/base.h"
 #include "hwy/contrib/thread_pool/thread_pool.h"
-#include "sentencepiece_processor.h"
+// copybara:import_next_line:sentencepiece
+#include "src/sentencepiece_processor.h"
 
 namespace gcpp {
 
diff --git a/gemma.h b/gemma.h
index 1c9caf8..5dc9f62 100644
--- a/gemma.h
+++ b/gemma.h
@@ -33,7 +33,8 @@
 #include "hwy/aligned_allocator.h"
 #include "hwy/base.h"  // hwy::bfloat16_t
 #include "hwy/contrib/thread_pool/thread_pool.h"
-#include "sentencepiece_processor.h"
+// copybara:import_next_line:sentencepiece
+#include "src/sentencepiece_processor.h"
 
 namespace gcpp {