diff --git a/lib/merge.js b/lib/merge.js
index 597a8191..f7761be3 100644
--- a/lib/merge.js
+++ b/lib/merge.js
@@ -256,33 +256,51 @@ function skipPullRequest(context, pullRequest, approvalCount) {
   return skip;
 }
 
-function waitUntilReady(pullRequest, context) {
+async function waitUntilReady(pullRequest, context) {
   const {
     octokit,
     config: { mergeRetries, mergeRetrySleep, mergeErrorFail }
   } = context;
 
+  const checks = await getPullRequestChecks(octokit, pullRequest);
   return retry(
     mergeRetries,
     mergeRetrySleep,
-    () => checkReady(pullRequest, context),
+    () => checkReady(pullRequest, checks, context),
     async () => {
-      const pr = await getPullRequest(octokit, pullRequest);
-      return checkReady(pr, context);
+      const [{ data: pr }, { data: checks }] = await Promise.all([
+        getPullRequest(octokit, pullRequest),
+        getPullRequestChecks(octokit, pullRequest),
+      ]);
+      return checkReady(pr, checks, context);
     },
     () => failOrInfo(mergeRetries, mergeErrorFail)
   );
 }
 
-function checkReady(pullRequest, context) {
+function checkReady(pullRequest, checks, context) {
   if (skipPullRequest(context, pullRequest)) {
     return "failure";
   }
-  return mergeable(pullRequest, context);
+  return mergeable(pullRequest, checks, context);
 }
 
-function mergeable(pullRequest, context) {
-  const { mergeable_state } = pullRequest;
+function mergeable(pullRequest, checks, context) {
+  const { mergeable, mergeable_state } = pullRequest;
+  const areChecksCompleted = checks.check_runs.every(check => check.status === "completed");
+
+  if (mergeable === null) {
+    return "retry";
+  }
+
+  if (!mergeable) {
+    return "failure";
+  }
+
+  if (!areChecksCompleted) {
+    return "retry";
+  }
+
   const {
     config: { mergeReadyState }
   } = context;
@@ -312,6 +330,19 @@ async function getPullRequest(octokit, pullRequest) {
   return pr;
 }
 
+async function getPullRequestChecks(octokit, pullRequest) {
+  logger.debug("Getting PR checks...");
+  const { data: checks } = await octokit.checks.listForRef({
+    owner: pullRequest.base.repo.owner.login,
+    repo: pullRequest.base.repo.name,
+    ref: pullRequest.head.sha,
+  });
+
+  logger.trace("PR checks:", checks);
+
+  return checks;
+}
+
 function tryMerge(
   octokit,
   pullRequest,