diff --git a/java/com/google/gerrit/server/schema/MigrateLabelFunctionsToSubmitRequirement.java b/java/com/google/gerrit/server/schema/MigrateLabelFunctionsToSubmitRequirement.java
index 491b5cd..f3c741f 100644
--- a/java/com/google/gerrit/server/schema/MigrateLabelFunctionsToSubmitRequirement.java
+++ b/java/com/google/gerrit/server/schema/MigrateLabelFunctionsToSubmitRequirement.java
@@ -37,6 +37,7 @@
 import java.util.Locale;
 import java.util.Map;
 import java.util.Optional;
+import java.util.stream.Collectors;
 import javax.inject.Inject;
 import org.eclipse.jgit.errors.ConfigInvalidException;
 import org.eclipse.jgit.lib.Config;
@@ -216,12 +217,19 @@
                   Arrays.asList(
                       cfg.getStringList(ProjectConfig.LABEL, labelName, ProjectConfig.KEY_VALUE)))
               .build();
+      ImmutableList<String> refPatterns =
+          ImmutableList.<String>builder()
+              .addAll(
+                  Arrays.asList(
+                      cfg.getStringList(ProjectConfig.LABEL, labelName, ProjectConfig.KEY_BRANCH)))
+              .build();
       LabelAttributes attributes =
           LabelAttributes.create(
               function == null ? "MaxWithBlock" : function,
               canOverride,
               ignoreSelfApproval,
-              values);
+              values,
+              refPatterns);
       labelTypes.put(labelName, attributes);
     }
     return labelTypes;
@@ -320,6 +328,15 @@
       default:
         break;
     }
+    if (!attributes.refPatterns().isEmpty()) {
+      builder.setApplicabilityExpression(
+          SubmitRequirementExpression.of(
+              String.join(
+                  " OR ",
+                  attributes.refPatterns().stream()
+                      .map(b -> "branch:\\\"" + b + "\\\"")
+                      .collect(Collectors.toList()))));
+    }
     return builder.build();
   }
 
@@ -435,13 +452,16 @@
 
     abstract ImmutableList<String> values();
 
+    abstract ImmutableList<String> refPatterns();
+
     static LabelAttributes create(
         String function,
         boolean canOverride,
         boolean ignoreSelfApproval,
-        ImmutableList<String> values) {
+        ImmutableList<String> values,
+        ImmutableList<String> refPatterns) {
       return new AutoValue_MigrateLabelFunctionsToSubmitRequirement_LabelAttributes(
-          function, canOverride, ignoreSelfApproval, values);
+          function, canOverride, ignoreSelfApproval, values, refPatterns);
     }
   }
 }
diff --git a/javatests/com/google/gerrit/acceptance/pgm/MigrateLabelFunctionsToSubmitRequirementIT.java b/javatests/com/google/gerrit/acceptance/pgm/MigrateLabelFunctionsToSubmitRequirementIT.java
index 74bfe0f..9d37497 100644
--- a/javatests/com/google/gerrit/acceptance/pgm/MigrateLabelFunctionsToSubmitRequirementIT.java
+++ b/javatests/com/google/gerrit/acceptance/pgm/MigrateLabelFunctionsToSubmitRequirementIT.java
@@ -17,6 +17,7 @@
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.gerrit.testing.GerritJUnit.assertThrows;
 
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import com.google.gerrit.acceptance.AbstractDaemonTest;
@@ -260,6 +261,96 @@
   }
 
   @Test
+  public void migrateBlockingLabel_withBranchAttribute() throws Exception {
+    createLabelWithBranch(
+        "Foo",
+        "MaxWithBlock",
+        /* ignoreSelfApproval= */ false,
+        ImmutableList.of("refs/heads/master"));
+
+    assertNonExistentSr(/* srName = */ "Foo");
+
+    TestUpdateUI updateUI = runMigration(/* expectedResult= */ Status.MIGRATED);
+    assertThat(updateUI.newlyCreatedSrs).isEqualTo(1);
+    assertThat(updateUI.existingSrsMismatchingWithMigration).isEqualTo(0);
+
+    assertExistentSr(
+        /* srName */ "Foo",
+        /* applicabilityExpression= */ "branch:\\\"refs/heads/master\\\"",
+        /* submittabilityExpression= */ "label:Foo=MAX AND -label:Foo=MIN",
+        /* canOverride= */ true);
+    assertLabelFunction("Foo", "NoBlock");
+  }
+
+  @Test
+  public void migrateBlockingLabel_withMultipleBranchAttributes() throws Exception {
+    createLabelWithBranch(
+        "Foo",
+        "MaxWithBlock",
+        /* ignoreSelfApproval= */ false,
+        ImmutableList.of("refs/heads/master", "refs/heads/develop"));
+
+    assertNonExistentSr(/* srName = */ "Foo");
+
+    TestUpdateUI updateUI = runMigration(/* expectedResult= */ Status.MIGRATED);
+    assertThat(updateUI.newlyCreatedSrs).isEqualTo(1);
+    assertThat(updateUI.existingSrsMismatchingWithMigration).isEqualTo(0);
+
+    assertExistentSr(
+        /* srName */ "Foo",
+        /* applicabilityExpression= */ "branch:\\\"refs/heads/master\\\" "
+            + "OR branch:\\\"refs/heads/develop\\\"",
+        /* submittabilityExpression= */ "label:Foo=MAX AND -label:Foo=MIN",
+        /* canOverride= */ true);
+    assertLabelFunction("Foo", "NoBlock");
+  }
+
+  @Test
+  public void migrateBlockingLabel_withRegexBranchAttribute() throws Exception {
+    createLabelWithBranch(
+        "Foo",
+        "MaxWithBlock",
+        /* ignoreSelfApproval= */ false,
+        ImmutableList.of("^refs/heads/main-.*"));
+
+    assertNonExistentSr(/* srName = */ "Foo");
+
+    TestUpdateUI updateUI = runMigration(/* expectedResult= */ Status.MIGRATED);
+    assertThat(updateUI.newlyCreatedSrs).isEqualTo(1);
+    assertThat(updateUI.existingSrsMismatchingWithMigration).isEqualTo(0);
+
+    assertExistentSr(
+        /* srName */ "Foo",
+        /* applicabilityExpression= */ "branch:\\\"^refs/heads/main-.*\\\"",
+        /* submittabilityExpression= */ "label:Foo=MAX AND -label:Foo=MIN",
+        /* canOverride= */ true);
+    assertLabelFunction("Foo", "NoBlock");
+  }
+
+  @Test
+  public void migrateBlockingLabel_withRegexAndNonRegexBranchAttributes() throws Exception {
+    createLabelWithBranch(
+        "Foo",
+        "MaxWithBlock",
+        /* ignoreSelfApproval= */ false,
+        ImmutableList.of("refs/heads/master", "^refs/heads/main-.*"));
+
+    assertNonExistentSr(/* srName = */ "Foo");
+
+    TestUpdateUI updateUI = runMigration(/* expectedResult= */ Status.MIGRATED);
+    assertThat(updateUI.newlyCreatedSrs).isEqualTo(1);
+    assertThat(updateUI.existingSrsMismatchingWithMigration).isEqualTo(0);
+
+    assertExistentSr(
+        /* srName */ "Foo",
+        /* applicabilityExpression= */ "branch:\\\"refs/heads/master\\\" "
+            + "OR branch:\\\"^refs/heads/main-.*\\\"",
+        /* submittabilityExpression= */ "label:Foo=MAX AND -label:Foo=MIN",
+        /* canOverride= */ true);
+    assertLabelFunction("Foo", "NoBlock");
+  }
+
+  @Test
   public void migrationIsIdempotent() throws Exception {
     String oldRefsConfigId;
     try (Repository repo = repoManager.openRepository(project)) {
@@ -381,6 +472,21 @@
     gApi.projects().name(project.get()).label(labelName).create(input);
   }
 
+  private void createLabelWithBranch(
+      String labelName,
+      String function,
+      boolean ignoreSelfApproval,
+      ImmutableList<String> refPatterns)
+      throws Exception {
+    LabelDefinitionInput input = new LabelDefinitionInput();
+    input.name = labelName;
+    input.function = function;
+    input.ignoreSelfApproval = ignoreSelfApproval;
+    input.values = ImmutableMap.of("+1", "Looks Good", " 0", "Don't Know", "-1", "Looks Bad");
+    input.branches = refPatterns;
+    gApi.projects().name(project.get()).label(labelName).create(input);
+  }
+
   @CanIgnoreReturnValue
   private SubmitRequirementApi createSubmitRequirement(
       String name, String submitExpression, boolean canOverride) throws Exception {