diff --git a/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeMessages.properties b/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeMessages.properties
index ffa749d..caaf3bf 100644
--- a/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeMessages.properties
+++ b/gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeMessages.properties
@@ -5,7 +5,7 @@
 changesMergedInProject = Merged Changes In {0}
 changesAbandonedInProject = Abandoned Changes In {0}
 
-revertChangeDefaultMessage = Revert \"{0}\"\n\nThis reverts commit {1}
+revertChangeDefaultMessage = Revert \"{0}\"\n\nThis reverts commit {1}.
 
 changeScreenTitleId = Change {0}
 outdatedHeader = Change depends on {0} outdated change(s) and should be rebased on the latest patch sets.
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/changedetail/RebaseChange.java b/gerrit-server/src/main/java/com/google/gerrit/server/changedetail/RebaseChange.java
index 9089710..89c507b 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/changedetail/RebaseChange.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/changedetail/RebaseChange.java
@@ -313,6 +313,9 @@
       OrmException, IOException, InvalidChangeOperationException,
       PathConflictException {
     Change change = chg;
+    if (!chg.currentPatchSetId().equals(patchSetId)) {
+      throw new InvalidChangeOperationException("patch set is not current");
+    }
     final PatchSet originalPatchSet = db.patchSets().get(patchSetId);
 
     final RevCommit rebasedCommit;
diff --git a/gerrit-server/src/main/resources/com/google/gerrit/server/change/ChangeMessages.properties b/gerrit-server/src/main/resources/com/google/gerrit/server/change/ChangeMessages.properties
index 11384a1..f05f23b 100644
--- a/gerrit-server/src/main/resources/com/google/gerrit/server/change/ChangeMessages.properties
+++ b/gerrit-server/src/main/resources/com/google/gerrit/server/change/ChangeMessages.properties
@@ -1,6 +1,6 @@
 # Changes to this file should also be made in
 # gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeMessages.properties
-revertChangeDefaultMessage = Revert \"{0}\"\n\nThis reverts commit {1}
+revertChangeDefaultMessage = Revert \"{0}\"\n\nThis reverts commit {1}.
 reviewerNotFound = {0} does not identify a registered user or group
 
 groupIsNotAllowed =  The group {0} cannot be added as reviewer.