diff --git a/resources/core-scoper.inc.php b/resources/core-scoper.inc.php
index fef3f3a..2cc4162 100644
--- a/resources/core-scoper.inc.php
+++ b/resources/core-scoper.inc.php
@@ -77,6 +77,17 @@
     'prefix' => 'Matomo\\Dependencies',
     'finders' => $finders,
     'patchers' => [
+        // patchers for PEAR (pear libraries do not use psr autoloading and put everything in a global namespace,
+        // so we can't automatically rename references to PEAR libraries)
+        static function (string $filePath, string $prefix, string $content) use ($isRenamingReferences): string {
+            if (!$isRenamingReferences) {
+                return $content;
+            }
+
+            $content = preg_replace('/([^\\\\A-Za-z0-9_])\\\\PEAR_/', '$1\\Matomo\\Dependencies\\PEAR_', $content);
+            return $content;
+        },
+
         // patchers for twig
         static function (string $filePath, string $prefix, string $content) use ($isRenamingReferences): string {
             // correct use statements in generated templates
diff --git a/src/Prefixers/CorePrefixer.php b/src/Prefixers/CorePrefixer.php
index b8e3fa0..592626d 100644
--- a/src/Prefixers/CorePrefixer.php
+++ b/src/Prefixers/CorePrefixer.php
@@ -25,6 +25,11 @@ class CorePrefixer extends Prefixer
         'symfony/console', // new version now depends on service-contracts which symfony/monolog-bridge also depends on
         'php-di/php-di',
         'geoip2/geoip2',
+        'pear/pear_exception',
+        'pear/archive_tar',
+        'pear/console_getopt',
+        'pear/pear-core-minimal',
+        'pear/pear_exception',
     ];
 
     const DEPENDENCIES_TO_IGNORE = [