diff --git a/.github/workflows/proto-version-check.yml b/.github/workflows/proto-version-check.yml
index 41b8e8336..ea300419d 100644
--- a/.github/workflows/proto-version-check.yml
+++ b/.github/workflows/proto-version-check.yml
@@ -13,14 +13,23 @@ jobs:
         uses: actions/github-script@v7
         with:
           script: |
-            const { data: files } = await github.rest.pulls.listFiles({
+            const files = await github.paginate(github.rest.pulls.listFiles, {
               owner: context.repo.owner,
               repo: context.repo.repo,
               pull_number: context.issue.number,
               per_page: 100,
             });
 
-            const pbFiles = files.filter(f => f.filename.endsWith('.pb.go') && f.patch);
+            const pbFiles = files.filter(f => f.filename.endsWith('.pb.go'));
+            const missingPatch = pbFiles.filter(f => !f.patch).map(f => f.filename);
+            if (missingPatch.length > 0) {
+              core.setFailed(
+                `Cannot inspect patch data for:\n` +
+                missingPatch.map(f => `- ${f}`).join('\n') +
+                `\nThis can happen with very large PRs. Verify proto versions manually.`
+              );
+              return;
+            }
             const versionPattern = /^[+-]\s*\/\/\s+protoc(?:-gen-go)?\s+v[\d.]+/;
             const violations = [];