diff --git a/packages/CodingStyle/src/Rector/String_/ManualJsonStringToJsonEncodeArrayRector.php b/packages/CodingStyle/src/Rector/String_/ManualJsonStringToJsonEncodeArrayRector.php
index 874f52ed7fe..14b4efc1948 100644
--- a/packages/CodingStyle/src/Rector/String_/ManualJsonStringToJsonEncodeArrayRector.php
+++ b/packages/CodingStyle/src/Rector/String_/ManualJsonStringToJsonEncodeArrayRector.php
@@ -149,7 +149,7 @@ CODE_SAMPLE
 
     private function isJsonString(string $stringValue): bool
     {
-        if (! (bool) Strings::match($stringValue, '#{(.*?\:.*?)}#')) {
+        if (! (bool) Strings::match($stringValue, '#{(.*?\:.*?)}#s')) {
             return false;
         }
 
diff --git a/packages/CodingStyle/tests/Rector/String_/ManualJsonStringToJsonEncodeArrayRector/Fixture/simple_row_with_spaces.php.inc b/packages/CodingStyle/tests/Rector/String_/ManualJsonStringToJsonEncodeArrayRector/Fixture/simple_row_with_spaces.php.inc
new file mode 100644
index 00000000000..206efd2c2b7
--- /dev/null
+++ b/packages/CodingStyle/tests/Rector/String_/ManualJsonStringToJsonEncodeArrayRector/Fixture/simple_row_with_spaces.php.inc
@@ -0,0 +1,29 @@
+<?php
+
+namespace Rector\CodingStyle\Tests\Rector\String_\ManualJsonStringToJsonEncodeArrayRector\Fixture;
+
+final class SimpleRowWithSpaces
+{
+    public function run()
+    {
+        $json = '{"name":"Paulie",
+            "surname":"Garand"}';
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\CodingStyle\Tests\Rector\String_\ManualJsonStringToJsonEncodeArrayRector\Fixture;
+
+final class SimpleRowWithSpaces
+{
+    public function run()
+    {
+        $jsonData = ['name' => 'Paulie', 'surname' => 'Garand'];
+        $json = \Nette\Utils\Json::encode($jsonData);
+    }
+}
+
+?>
diff --git a/packages/CodingStyle/tests/Rector/String_/ManualJsonStringToJsonEncodeArrayRector/ManualJsonStringToJsonEncodeArrayRectorTest.php b/packages/CodingStyle/tests/Rector/String_/ManualJsonStringToJsonEncodeArrayRector/ManualJsonStringToJsonEncodeArrayRectorTest.php
index c961d329c74..38ec18881f0 100644
--- a/packages/CodingStyle/tests/Rector/String_/ManualJsonStringToJsonEncodeArrayRector/ManualJsonStringToJsonEncodeArrayRectorTest.php
+++ b/packages/CodingStyle/tests/Rector/String_/ManualJsonStringToJsonEncodeArrayRector/ManualJsonStringToJsonEncodeArrayRectorTest.php
@@ -18,6 +18,7 @@ final class ManualJsonStringToJsonEncodeArrayRectorTest extends AbstractRectorTe
             __DIR__ . '/Fixture/with_implode.php.inc',
             __DIR__ . '/Fixture/without_assign.php.inc',
             __DIR__ . '/Fixture/array_concat.php.inc',
+            __DIR__ . '/Fixture/simple_row_with_spaces.php.inc',
         ]);
     }