diff --git a/src/main/java/jenkins/plugins/git/GitSCMFileSystem.java b/src/main/java/jenkins/plugins/git/GitSCMFileSystem.java
index 35ea53e4f5..5a854b5628 100644
--- a/src/main/java/jenkins/plugins/git/GitSCMFileSystem.java
+++ b/src/main/java/jenkins/plugins/git/GitSCMFileSystem.java
@@ -327,7 +327,7 @@ static HeadNameResult calculate(@NonNull BranchSpec branchSpec,
                         prefix = null;
                     } else {
                         // check for commit-id
-                        final String regex = "^[a-fA-F0-9]{40}$";
+                        final String regex = "^([a-fA-F0-9]{40}|[a-fA-F0-9]{64})$";
                         final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
                         final Matcher matcher = pattern.matcher(branchSpecExpandedName);