diff --git i/src/main/java/com/cloudbees/jenkins/plugins/bitbucket/BitbucketSCMSource.java w/src/main/java/com/cloudbees/jenkins/plugins/bitbucket/BitbucketSCMSource.java
index 64be0e3..4bf925f 100644
--- i/src/main/java/com/cloudbees/jenkins/plugins/bitbucket/BitbucketSCMSource.java
+++ w/src/main/java/com/cloudbees/jenkins/plugins/bitbucket/BitbucketSCMSource.java
@@ -365,8 +365,8 @@ public class BitbucketSCMSource extends SCMSource {
                         new ContributorMetadataAction(pull.getAuthorLogin(), null, null)
                 );
                 observe(criteria, observer, listener,
-                        pull.getSource().getRepository().getOwnerName(),
-                        pull.getSource().getRepository().getRepositoryName(),
+                        pull.getDestination().getRepository().getOwnerName(),
+                        pull.getDestination().getRepository().getRepositoryName(),
                         pull.getSource().getBranch().getName(),
                         hash,
                         pull);
@@ -434,7 +434,7 @@ public class BitbucketSCMSource extends SCMSource {
                 public boolean exists(@NonNull String path) throws IOException {
                     try {
                         // TODO should be checking the revision not the head
-                        return bitbucket.checkPathExists(branchName, path);
+                        return bitbucket.checkPathExists(hash, path);
                     } catch (InterruptedException e) {
                         throw new IOException("Interrupted", e);
                     }
@@ -467,6 +467,10 @@ public class BitbucketSCMSource extends SCMSource {
         BitbucketApi bitbucket = head instanceof PullRequestSCMHead
                 ? buildBitbucketClient((PullRequestSCMHead) head)
                 : buildBitbucketClient();
+        if (head instanceof PullRequestSCMHead) {
+            BitbucketPullRequest pr = bitbucket.getPullRequestById(Integer.valueOf(((PullRequestSCMHead) head).getId()));
+            return new AbstractGitSCMSource.SCMRevisionImpl(head, pr.getSource().getBranch().getRawNode());
+        }
         String branchName = head instanceof PullRequestSCMHead ? ((PullRequestSCMHead) head).getBranchName() : head.getName();
         List<? extends BitbucketBranch> branches = bitbucket.getBranches();
         for (BitbucketBranch b : branches) {
@@ -579,7 +583,7 @@ public class BitbucketSCMSource extends SCMSource {
     protected List<UserRemoteConfig> getGitRemoteConfigs(PullRequestSCMHead head) {
         List<UserRemoteConfig> result = new ArrayList<UserRemoteConfig>();
         String remote = getRemote(head.getRepoOwner(), head.getRepository(), BitbucketRepositoryType.GIT);
-        result.add(new UserRemoteConfig(remote, getRemoteName(), "+refs/heads/" + head.getBranchName(), getCheckoutEffectiveCredentials()));
+        result.add(new UserRemoteConfig(remote, getRemoteName(), "+refs/pull-requests/" + head.getId() + "/from:" + head.getBranchName(), getCheckoutEffectiveCredentials()));
         return result;
     }