diff --git a/core/modules/update/src/ModuleVersion.php b/core/modules/update/src/ModuleVersion.php
index 94297824d9..96657948ef 100644
--- a/core/modules/update/src/ModuleVersion.php
+++ b/core/modules/update/src/ModuleVersion.php
@@ -160,18 +160,20 @@ public function getVersionExtra() {
   }
 
   /**
-   * Gets the support branch.
+   * Determines if the version is in a specific support branch.
    *
-   * @return string
-   *   The support branch as is used in update XML files.
+   * @param string $support_branch
+   *   The support branch.
+   *
+   * @return bool
+   *   TRUE if the version is in the support branch, otherwise FALSE.
    */
-  public function getSupportBranch() {
-    $branch = $this->useCorePrefix ? static::CORE_COMPATIBILITY_PREFIX : '';
-    $branch .= $this->majorVersion . '.';
-    if ($this->minorVersion !== NULL) {
-      $branch .= $this->minorVersion . '.';
+  public function isInSupportBranch($support_branch) {
+    $branch_version = static::createFromSupportBranch($support_branch);
+    if ($branch_version->minorVersion === NULL) {
+      return $this->getMajorVersion() === $branch_version->getMajorVersion();
     }
-    return $branch;
+    return $this->getMajorVersion() === $branch_version->getMajorVersion() && $this->getMinorVersion() === $branch_version->getMinorVersion();
   }
 
 }
diff --git a/core/modules/update/tests/src/Unit/ModuleVersionTest.php b/core/modules/update/tests/src/Unit/ModuleVersionTest.php
index dcb3c10e60..0a42f8c7c0 100644
--- a/core/modules/update/tests/src/Unit/ModuleVersionTest.php
+++ b/core/modules/update/tests/src/Unit/ModuleVersionTest.php
@@ -52,16 +52,6 @@ public function testGetVersionExtra($version, $expected_version_info) {
     $this->assertSame($expected_version_info['extra'], $version->getVersionExtra());
   }
 
-  /**
-   * @covers ::getSupportBranch
-   *
-   * @dataProvider providerVersionInfos
-   */
-  public function testGetSupportBranch($version, $expected_version_info) {
-    $version = ModuleVersion::createFromVersionString($version);
-    $this->assertSame($expected_version_info['branch'], $version->getSupportBranch());
-  }
-
   /**
    * @covers ::createFromSupportBranch
    *
@@ -258,4 +248,51 @@ public function providerVersionInfos() {
     ];
   }
 
+  /**
+   * @covers ::isInSupportBranch
+   *
+   * @dataProvider providerIsInSupportBranch
+   */
+  public function testIsInSupportBranch($version, $branch, $expected_result) {
+    $this->assertEquals($expected_result, ModuleVersion::createFromVersionString($version)->isInSupportBranch($branch));
+  }
+
+  /**
+   * Data provider for testIsInSupportBranch().
+   */
+  public function providerIsInSupportBranch() {
+    return [
+      [
+        '1.2.3',
+        '1.',
+        TRUE,
+      ],
+      [
+        '1.2.3',
+        '1.2.',
+        TRUE,
+      ],
+      [
+        '1.2.3',
+        '1.3.',
+        FALSE,
+      ],
+      [
+        '1.2.3',
+        '2.',
+        FALSE,
+      ],
+      [
+        '1.2.3',
+        '2.2.',
+        FALSE,
+      ],
+      [
+        '1.2.3',
+        '2.3.',
+        FALSE,
+      ],
+    ];
+  }
+
 }
diff --git a/core/modules/update/update.compare.inc b/core/modules/update/update.compare.inc
index ab191fed5b..71ac563939 100644
--- a/core/modules/update/update.compare.inc
+++ b/core/modules/update/update.compare.inc
@@ -261,7 +261,15 @@ function update_calculate_project_update_status(&$project_data, $available) {
     $supported_branches = explode(',', $available['supported_branches']);
   }
 
-  if (in_array($existing_module_version->getSupportBranch(), $supported_branches)) {
+  $is_in_supported_branch = function (ModuleVersion $version) use ($supported_branches) {
+    foreach ($supported_branches as $supported_branch) {
+      if ($version->isInSupportBranch($supported_branch)) {
+        return TRUE;
+      }
+    }
+    return FALSE;
+  };
+  if ($is_in_supported_branch($existing_module_version)) {
     // Still supported, stay at the current major version.
     $target_major = $existing_major;
   }
@@ -355,7 +363,7 @@ function update_calculate_project_update_status(&$project_data, $available) {
     // be one of those being compared. They would not have version_major
     // set, so we must call isset first.
     if ($release_major_version !== NULL && $release_major_version > $target_major) {
-      if (in_array($release_module_version->getSupportBranch(), $supported_branches)) {
+      if ($is_in_supported_branch($release_module_version)) {
         if (!isset($project_data['also'])) {
           $project_data['also'] = [];
         }