diff --git a/src/Platforms/PostgreSQLPlatform.php b/src/Platforms/PostgreSQLPlatform.php
index 74cf7eda9dd..7db8bf249ad 100644
--- a/src/Platforms/PostgreSQLPlatform.php
+++ b/src/Platforms/PostgreSQLPlatform.php
@@ -9,11 +9,8 @@
 use Doctrine\DBAL\Schema\Index;
 use Doctrine\DBAL\Schema\Sequence;
 use Doctrine\DBAL\Schema\TableDiff;
-use Doctrine\DBAL\Types\BigIntType;
 use Doctrine\DBAL\Types\BinaryType;
 use Doctrine\DBAL\Types\BlobType;
-use Doctrine\DBAL\Types\IntegerType;
-use Doctrine\DBAL\Types\Type;
 use Doctrine\Deprecations\Deprecation;
 use UnexpectedValueException;
 
@@ -533,7 +530,7 @@ public function getAlterTableSQL(TableDiff $diff)
                 $sql[] = 'ALTER TABLE ' . $diff->getName($this)->getQuotedName($this) . ' ' . $query;
             }
 
-            if ($columnDiff->hasChanged('default') || $this->typeChangeBreaksDefaultValue($columnDiff)) {
+            if ($columnDiff->hasChanged('default')) {
                 $defaultClause = $column->getDefault() === null
                     ? ' DROP DEFAULT'
                     : ' SET' . $this->getDefaultValueDeclarationSQL($column->toArray());
@@ -1221,7 +1218,7 @@ public function getBlobTypeDeclarationSQL(array $column)
      */
     public function getDefaultValueDeclarationSQL($column)
     {
-        if ($this->isSerialColumn($column)) {
+        if (isset($column['autoincrement']) && $column['autoincrement'] === true) {
             return '';
         }
 
@@ -1256,38 +1253,6 @@ public function getJsonTypeDeclarationSQL(array $column)
         return 'JSON';
     }
 
-    /**
-     * @param mixed[] $column
-     */
-    private function isSerialColumn(array $column): bool
-    {
-        return isset($column['type'], $column['autoincrement'])
-            && $column['autoincrement'] === true
-            && $this->isNumericType($column['type']);
-    }
-
-    /**
-     * Check whether the type of a column is changed in a way that invalidates the default value for the column
-     */
-    private function typeChangeBreaksDefaultValue(ColumnDiff $columnDiff): bool
-    {
-        if ($columnDiff->fromColumn === null) {
-            return $columnDiff->hasChanged('type');
-        }
-
-        $oldTypeIsNumeric = $this->isNumericType($columnDiff->fromColumn->getType());
-        $newTypeIsNumeric = $this->isNumericType($columnDiff->column->getType());
-
-        // default should not be changed when switching between numeric types and the default comes from a sequence
-        return $columnDiff->hasChanged('type')
-            && ! ($oldTypeIsNumeric && $newTypeIsNumeric && $columnDiff->column->getAutoincrement());
-    }
-
-    private function isNumericType(Type $type): bool
-    {
-        return $type instanceof IntegerType || $type instanceof BigIntType;
-    }
-
     private function getOldColumnComment(ColumnDiff $columnDiff): ?string
     {
         return $columnDiff->fromColumn !== null ? $this->getColumnComment($columnDiff->fromColumn) : null;
diff --git a/tests/Platforms/PostgreSQLPlatformTest.php b/tests/Platforms/PostgreSQLPlatformTest.php
index 1f731d50558..407dbef47bf 100644
--- a/tests/Platforms/PostgreSQLPlatformTest.php
+++ b/tests/Platforms/PostgreSQLPlatformTest.php
@@ -891,7 +891,6 @@ public function testAltersTableColumnCommentIfRequiredByType(): void
         self::assertSame(
             [
                 'ALTER TABLE "foo" ALTER "bar" TYPE TIMESTAMP(0) WITHOUT TIME ZONE',
-                'ALTER TABLE "foo" ALTER "bar" DROP DEFAULT',
                 'COMMENT ON COLUMN "foo"."bar" IS \'(DC2Type:datetime_immutable)\'',
             ],
             $this->platform->getAlterTableSQL($tableDiff)