tests/src/Functional/EntityTestTest.php |  7 ++++++-
 tests/src/Functional/NodeTest.php       |  7 ++++++-
 tests/src/Functional/TermTest.php       | 13 +++++++++++++
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/tests/src/Functional/EntityTestTest.php b/tests/src/Functional/EntityTestTest.php
index 86ccb42..87fe639 100644
--- a/tests/src/Functional/EntityTestTest.php
+++ b/tests/src/Functional/EntityTestTest.php
@@ -94,7 +94,7 @@ class EntityTestTest extends ResourceTestBase {
   protected function getExpectedNormalizedEntity() {
     $self_url = Url::fromUri('base:/jsonapi/entity_test/entity_test/' . $this->entity->uuid())->setAbsolute()->toString(TRUE)->getGeneratedUrl();
     $author = User::load(0);
-    return [
+    $normalization = [
       'jsonapi' => [
         'meta' => [
           'links' => [
@@ -139,6 +139,11 @@ class EntityTestTest extends ResourceTestBase {
         ],
       ],
     ];
+    // @todo Remove this modification when JSON API requires Drupal 8.5 or newer, and do an early return above instead.
+    if (floatval(\Drupal::VERSION) < 8.5) {
+      unset($normalization['data']['attributes']['internal_string_field']);
+    }
+    return $normalization;
   }
 
   /**
diff --git a/tests/src/Functional/NodeTest.php b/tests/src/Functional/NodeTest.php
index c7ebca3..4c34cb8 100644
--- a/tests/src/Functional/NodeTest.php
+++ b/tests/src/Functional/NodeTest.php
@@ -115,7 +115,7 @@ class NodeTest extends ResourceTestBase {
   protected function getExpectedNormalizedEntity() {
     $author = User::load($this->entity->getOwnerId());
     $self_url = Url::fromUri('base:/jsonapi/node/camelids/' . $this->entity->uuid())->setAbsolute()->toString(TRUE)->getGeneratedUrl();
-    return [
+    $normalization = [
       'jsonapi' => [
         'meta' => [
           'links' => [
@@ -196,6 +196,11 @@ class NodeTest extends ResourceTestBase {
         ],
       ],
     ];
+    // @todo Remove this modification when JSON API requires Drupal 8.5 or newer, and do an early return above instead.
+    if (floatval(\Drupal::VERSION) < 8.5) {
+      unset($normalization['data']['attributes']['revision_default']);
+    }
+    return $normalization;
   }
 
   /**
diff --git a/tests/src/Functional/TermTest.php b/tests/src/Functional/TermTest.php
index 2e0034a..067e140 100644
--- a/tests/src/Functional/TermTest.php
+++ b/tests/src/Functional/TermTest.php
@@ -175,6 +175,14 @@ class TermTest extends ResourceTestBase {
         ];
         break;
     }
+
+    // @todo Remove thi when JSON API requires Drupal 8.5 or newer.
+    if (floatval(\Drupal::VERSION) < 8.5) {
+      $expected_parent_normalization = [
+        'data' => [],
+      ];
+    }
+
     return [
       'jsonapi' => [
         'meta' => [
@@ -230,6 +238,11 @@ class TermTest extends ResourceTestBase {
         ],
       ],
     ];
+    // @todo Remove this modification when JSON API requires Drupal 8.5 or newer, and do an early return above instead.
+    if (floatval(\Drupal::VERSION) < 8.5) {
+      $normalization['data']['relationships']['parent'] =  ['data' => []];
+    }
+    return $normalization;
   }
 
   /**