diff --git a/src/main/java/com/googlesource/gerrit/plugins/importer/GerritApi.java b/src/main/java/com/googlesource/gerrit/plugins/importer/GerritApi.java
index 88cddce..ef1c1a6 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/importer/GerritApi.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/importer/GerritApi.java
@@ -82,22 +82,25 @@
     final Integer major;
     final Integer minor;
     final Integer patch;
+    final Integer revision;
     final String qualifier;
 
     Version(String formatted) {
       this.formatted = formatted;
 
-      Matcher m = Pattern.compile("(\\d+)\\.(\\d+)(\\.(\\d+))?(-(.+))?")
+      Matcher m = Pattern.compile("(\\d+)\\.(\\d+)(\\.(\\d+))?(\\.(\\d+))?(-(.+))?")
           .matcher(formatted);
       if (m.matches()) {
         this.major = Integer.parseInt(m.group(1));
         this.minor = Integer.parseInt(m.group(2));
         this.patch = m.group(3) != null ? Integer.parseInt(m.group(4)) : null;
-        this.qualifier = m.group(5) != null ? m.group(6) : null;
+        this.revision = m.group(5) != null ? Integer.parseInt(m.group(6)) : null;
+        this.qualifier = m.group(7) != null ? m.group(8) : null;
       } else {
         this.major = null;
         this.minor = null;
         this.patch = null;
+        this.revision = null;
         this.qualifier = null;
       }
     }
@@ -108,7 +111,7 @@
         // either of the compared version is not valid
         return -1;
       }
-      if (major == o.major) {
+      if (Objects.equal(major, o.major)) {
         if (Objects.equal(minor, o.minor)) {
           if (Objects.equal(patch, o.patch)) {
             return 0;
diff --git a/src/main/java/com/googlesource/gerrit/plugins/importer/ReplayChangesStep.java b/src/main/java/com/googlesource/gerrit/plugins/importer/ReplayChangesStep.java
index 8cc0c83..2820b15 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/importer/ReplayChangesStep.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/importer/ReplayChangesStep.java
@@ -25,6 +25,7 @@
 import com.google.gerrit.reviewdb.client.Branch;
 import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.reviewdb.client.RefNames;
 import com.google.gerrit.reviewdb.server.ReviewDb;
 import com.google.gerrit.server.Sequences;
 import com.google.gerrit.server.update.UpdateException;
@@ -39,7 +40,6 @@
 import com.google.inject.assistedinject.Assisted;
 
 import org.eclipse.jgit.errors.ConfigInvalidException;
-import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ProgressMonitor;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevWalk;
@@ -215,7 +215,7 @@
   private Change findChange(ChangeInfo c) throws OrmException {
     List<Change> changes = ChangeData.asChanges(
         queryProvider.get().byBranchKey(
-            new Branch.NameKey(targetProject, fullName(c.branch)),
+            new Branch.NameKey(targetProject, RefNames.fullName(c.branch)),
             new Change.Key(c.changeId)));
     if (changes.isEmpty()) {
       return null;
@@ -231,7 +231,7 @@
 
     Change change =
         new Change(new Change.Key(c.changeId), changeId, accountUtil.resolveUser(api, c.owner),
-            new Branch.NameKey(targetProject, fullName(c.branch)), c.created);
+            new Branch.NameKey(targetProject, RefNames.fullName(c.branch)), c.created);
     change.setStatus(Change.Status.forChangeStatus(c.status));
     change.setTopic(c.topic);
     change.setLastUpdatedOn(c.updated);
@@ -247,11 +247,4 @@
     }
     db.changes().upsert(Collections.singleton(change));
   }
-
-  private static String fullName(String branch) {
-    if (branch.startsWith(Constants.R_HEADS)) {
-      return branch;
-    }
-    return Constants.R_HEADS + branch;
-  }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/importer/ReplayInlineCommentsStep.java b/src/main/java/com/googlesource/gerrit/plugins/importer/ReplayInlineCommentsStep.java
index ec1062c..b1ec866 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/importer/ReplayInlineCommentsStep.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/importer/ReplayInlineCommentsStep.java
@@ -209,6 +209,8 @@
             c.range.endLine,
             c.range.endCharacter));
         e.lineNbr = c.range.endLine;
+      } else {
+        e.lineNbr = c.line == null ? 0 : c.line;
       }
       ups.add(e);
     }