diff --git a/src/main/java/org/gitlab/api/GitlabAPI.java b/src/main/java/org/gitlab/api/GitlabAPI.java
index c0c88fa7..e1b63413 100644
--- a/src/main/java/org/gitlab/api/GitlabAPI.java
+++ b/src/main/java/org/gitlab/api/GitlabAPI.java
@@ -2120,10 +2120,7 @@ public List<GitlabCommit> getCommits(GitlabMergeRequest mergeRequest) throws IOE
     }
 
     public List<GitlabCommit> getCommits(GitlabMergeRequest mergeRequest, Pagination pagination) throws IOException {
-        Integer projectId = mergeRequest.getSourceProjectId();
-        if (projectId == null) {
-            projectId = mergeRequest.getProjectId();
-        }
+        Integer projectId = mergeRequest.getProjectId();
 
         String tailUrl = GitlabProject.URL + "/" + sanitizeProjectId(projectId) +
                 GitlabMergeRequest.URL + "/" + mergeRequest.getIid() +