diff --git a/tests/Composer/Test/Downloader/XzDownloaderTest.php b/tests/Composer/Test/Downloader/XzDownloaderTest.php
index 1cabefb56..d461c4823 100644
--- a/tests/Composer/Test/Downloader/XzDownloaderTest.php
+++ b/tests/Composer/Test/Downloader/XzDownloaderTest.php
@@ -36,6 +36,9 @@ class XzDownloaderTest extends TestCase
         if (Platform::isWindows()) {
             $this->markTestSkipped('Skip test on Windows');
         }
+        if (PHP_INT_SIZE === 4) {
+            $this->markTestSkipped('Skip test on 32bit');
+        }
         $this->testDir = self::getUniqueTmpDirectory();
     }
 
diff --git a/tests/Composer/Test/InstallerTest.php b/tests/Composer/Test/InstallerTest.php
index 3db9294d7..a7fca8e00 100644
--- a/tests/Composer/Test/InstallerTest.php
+++ b/tests/Composer/Test/InstallerTest.php
@@ -509,7 +509,7 @@ class InstallerTest extends TestCase
             try {
                 $testData = self::readTestFile($file, $fixturesDir);
                 // skip 64bit related tests on 32bit
-                if (str_contains($testData['EXPECT'], 'php-64bit') && PHP_INT_SIZE === 4) {
+                if (str_contains($testData['EXPECT-OUTPUT'], 'php-64bit') && PHP_INT_SIZE === 4) {
                     continue;
                 }