diff --git a/src/Connection/ImapQueryBuilder.php b/src/Connection/ImapQueryBuilder.php
index facbea6..0054655 100644
--- a/src/Connection/ImapQueryBuilder.php
+++ b/src/Connection/ImapQueryBuilder.php
@@ -440,7 +440,7 @@ protected function compileBasic(array $where): string
         if ($where['value'] instanceof RawQueryValue) {
             $part .= ' '.$where['value']->value;
         } elseif ($where['value']) {
-            $part .= ' "'.$where['value'].'"';
+            $part .= ' "'.Str::toImapUtf7($where['value']).'"';
         }
 
         if ($where['not']) {
diff --git a/tests/Unit/Connection/ImapQueryBuilderTest.php b/tests/Unit/Connection/ImapQueryBuilderTest.php
index 8035f30..cd2760e 100644
--- a/tests/Unit/Connection/ImapQueryBuilderTest.php
+++ b/tests/Unit/Connection/ImapQueryBuilderTest.php
@@ -220,3 +220,11 @@ function (ImapQueryBuilder $q) {
 
     expect($builder->toImap())->toBe('FOO bar');
 });
+
+test('converts values from utf-8 to utf-7', function () {
+    $builder = new ImapQueryBuilder;
+
+    $builder->where('foo', 'Joué');
+
+    expect($builder->toImap())->toBe('FOO "Jou&AOk-"');
+});