diff --git a/src/main/java/org/jenkinsci/plugins/workflow/steps/scm/SCMStep.java b/src/main/java/org/jenkinsci/plugins/workflow/steps/scm/SCMStep.java
index 4bbb8d2..0870567 100644
--- a/src/main/java/org/jenkinsci/plugins/workflow/steps/scm/SCMStep.java
+++ b/src/main/java/org/jenkinsci/plugins/workflow/steps/scm/SCMStep.java
@@ -111,24 +111,24 @@ public final void checkout(Run<?,?> run, FilePath workspace, TaskListener listen
             Run<?,?> prev = run.getPreviousBuild();
             if (prev != null) {
                 synchronized (prev) {
-                MultiSCMRevisionState state = prev.getAction(MultiSCMRevisionState.class);
-                if (state != null) {
-                    baseline = state.get(scm);
-                }
+                    MultiSCMRevisionState state = prev.getAction(MultiSCMRevisionState.class);
+                    if (state != null) {
+                        baseline = state.get(scm);
+                    }
                 }
             }
             scm.checkout(run, launcher, workspace, listener, changelogFile, baseline);
             SCMRevisionState pollingBaseline = null;
-            if (poll || changelog) {
+            if (poll) {
                 pollingBaseline = scm.calcRevisionsFromBuild(run, workspace, launcher, listener);
                 if (pollingBaseline != null) {
                     synchronized (run) {
-                    MultiSCMRevisionState state = run.getAction(MultiSCMRevisionState.class);
-                    if (state == null) {
-                        state = new MultiSCMRevisionState();
-                        run.addAction(state);
-                    }
-                    state.add(scm, pollingBaseline);
+                        MultiSCMRevisionState state = run.getAction(MultiSCMRevisionState.class);
+                        if (state == null) {
+                            state = new MultiSCMRevisionState();
+                            run.addAction(state);
+                        }
+                        state.add(scm, pollingBaseline);
                     }
                 }
             }