diff --git a/pom.xml b/pom.xml
index 3c535b86..a17a6537 100644
--- a/pom.xml
+++ b/pom.xml
@@ -78,6 +78,12 @@
                 <scope>import</scope>
                 <type>pom</type>
             </dependency>
+            <!-- TODO until in BOM -->
+            <dependency>
+                <groupId>org.jenkins-ci.plugins.workflow</groupId>
+                <artifactId>workflow-cps</artifactId>
+                <version>3817.vd20b_7e2b_692b_</version>
+            </dependency>
         </dependencies>
     </dependencyManagement>
     <dependencies>
diff --git a/src/main/java/org/jenkinsci/plugins/workflow/job/WorkflowJob.java b/src/main/java/org/jenkinsci/plugins/workflow/job/WorkflowJob.java
index aa98e73e..409ef336 100644
--- a/src/main/java/org/jenkinsci/plugins/workflow/job/WorkflowJob.java
+++ b/src/main/java/org/jenkinsci/plugins/workflow/job/WorkflowJob.java
@@ -540,17 +540,23 @@ public void replaceAction(@NonNull Action a) {
 
     @NonNull
     @Override public Collection<? extends SCM> getSCMs() {
+        Collection<? extends SCM> definedSCMs = definition != null
+            ? definition.getSCMs()
+            : Collections.emptySet();
         WorkflowRun b = getLastSuccessfulBuild();
         if (b == null) {
             b = getLastCompletedBuild();
         }
         if (b == null) {
-            return Collections.emptySet();
+            return definedSCMs;
         }
         Map<String,SCM> scms = new LinkedHashMap<>();
         for (WorkflowRun.SCMCheckout co : b.checkouts(null)) {
             scms.put(co.scm.getKey(), co.scm);
         }
+        for (SCM scm : definedSCMs) {
+            scms.put(scm.getKey(), scm);
+        }
         return scms.values();
     }
 
diff --git a/src/test/java/org/jenkinsci/plugins/workflow/job/WorkflowJobTest.java b/src/test/java/org/jenkinsci/plugins/workflow/job/WorkflowJobTest.java
index 54ed91ce..1a3ef6e3 100644
--- a/src/test/java/org/jenkinsci/plugins/workflow/job/WorkflowJobTest.java
+++ b/src/test/java/org/jenkinsci/plugins/workflow/job/WorkflowJobTest.java
@@ -76,6 +76,32 @@ public class WorkflowJobTest {
         j.assertLogContains("second version", b2);
     }
 
+    @Issue("JENKINS-38669")
+    @Test public void nonEmptySCMListForGitSCMJobBeforeBuild() throws Exception {
+        WorkflowJob p = j.jenkins.createProject(WorkflowJob.class, "p");
+        CpsScmFlowDefinition def = new CpsScmFlowDefinition(new GitSCM("I don't care"), "Jenkinsfile");
+        assertEquals("Expecting one SCM for definition", 1, def.getSCMs().size());
+        p.setDefinition(def);
+        assertEquals("Expecting one SCM", 1, p.getSCMs().size());
+    }
+
+    @Issue("JENKINS-38669")
+    @Test public void neverBuiltSCMBasedJobMustBeTriggerableByHook() throws Exception {
+        sampleRepo.init();
+        sampleRepo.write("Jenkinsfile", "echo 'first version'");
+        sampleRepo.git("add", "Jenkinsfile");
+        sampleRepo.git("commit", "-m", "init");
+        WorkflowJob p = j.jenkins.createProject(WorkflowJob.class, "p");
+        p.addTrigger(new SCMTrigger(""));
+        p.setDefinition(new CpsScmFlowDefinition(new GitSCM(sampleRepo.toString()), "Jenkinsfile"));
+        j.jenkins.setQuietPeriod(0);
+        j.createWebClient().getPage(new WebRequest(j.createWebClient().createCrumbedUrl(p.getUrl() + "polling"), HttpMethod.POST));
+        j.waitUntilNoActivity();
+        WorkflowRun b1 = p.getLastBuild();
+        assertEquals(1, b1.getNumber());
+        j.assertLogContains("first version", b1);
+    }
+
     @Test
     public void addAction() throws Exception {
         WorkflowJob p = j.jenkins.createProject(WorkflowJob.class, "p");