diff --git a/rules-tests/Php73/Rector/FuncCall/JsonThrowOnErrorRector/Fixture/fixture.php.inc b/rules-tests/Php73/Rector/FuncCall/JsonThrowOnErrorRector/Fixture/fixture.php.inc
index e47df536fe3..4447810e978 100644
--- a/rules-tests/Php73/Rector/FuncCall/JsonThrowOnErrorRector/Fixture/fixture.php.inc
+++ b/rules-tests/Php73/Rector/FuncCall/JsonThrowOnErrorRector/Fixture/fixture.php.inc
@@ -10,6 +10,8 @@ function jsonThrowOnError()
     json_decode($json, true, 215);
 
     json_decode($json, true, 122, JSON_THROW_ON_ERROR);
+
+    json_decode($json, true, 122, JSON_UNESCAPED_UNICODE);
 }
 
 ?>
@@ -26,6 +28,8 @@ function jsonThrowOnError()
     json_decode($json, true, 215, JSON_THROW_ON_ERROR);
 
     json_decode($json, true, 122, JSON_THROW_ON_ERROR);
+
+    json_decode($json, true, 122, JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR);
 }
 
 ?>
diff --git a/rules/Php73/Rector/FuncCall/JsonThrowOnErrorRector.php b/rules/Php73/Rector/FuncCall/JsonThrowOnErrorRector.php
index d79e97d8d57..82a5af714ce 100644
--- a/rules/Php73/Rector/FuncCall/JsonThrowOnErrorRector.php
+++ b/rules/Php73/Rector/FuncCall/JsonThrowOnErrorRector.php
@@ -26,6 +26,7 @@
 final class JsonThrowOnErrorRector extends AbstractRector implements MinPhpVersionInterface
 {
     private bool $hasChanged = false;
+    private const FLAGS = ['JSON_THROW_ON_ERROR'];
 
     public function __construct(
         private readonly ValueResolver $valueResolver,
@@ -135,20 +136,22 @@ private function shouldSkipFuncCall(FuncCall $funcCall): bool
 
     private function processJsonEncode(FuncCall $funcCall): ?FuncCall
     {
+        $flags = [];
         if (isset($funcCall->args[1])) {
-            return null;
+            $flags = $this->getFlags($funcCall->args[1]);
+        }
+        if (!is_null($newArg = $this->getArgWithFlags($flags))) {
+            $this->hasChanged = true;
+            $funcCall->args[1] = $newArg;
         }
-
-        $this->hasChanged = true;
-
-        $funcCall->args[1] = new Arg($this->createConstFetch('JSON_THROW_ON_ERROR'));
         return $funcCall;
     }
 
     private function processJsonDecode(FuncCall $funcCall): ?FuncCall
     {
+        $flags = [];
         if (isset($funcCall->args[3])) {
-            return null;
+            $flags = $this->getFlags($funcCall->args[3]);
         }
 
         // set default to inter-args
@@ -160,9 +163,10 @@ private function processJsonDecode(FuncCall $funcCall): ?FuncCall
             $funcCall->args[2] = new Arg(new Int_(512));
         }
 
-        $this->hasChanged = true;
-        $funcCall->args[3] = new Arg($this->createConstFetch('JSON_THROW_ON_ERROR'));
-
+        if (!is_null($newArg = $this->getArgWithFlags($flags))) {
+            $this->hasChanged = true;
+            $funcCall->args[3] = $newArg;
+        }
         return $funcCall;
     }
 
@@ -186,4 +190,63 @@ private function isFirstValueStringOrArray(FuncCall $funcCall): bool
 
         return is_array($value);
     }
+
+    private function getFlags(Arg|Node\Expr\BinaryOp\BitwiseOr|ConstFetch $arg, array $result = []): array
+    {
+        if ($arg instanceof ConstFetch) {
+            $constFetch = $arg;
+        } else {
+            if ($arg instanceof Arg) {
+                $array = $arg->value->jsonSerialize();
+            } else {
+                $array = $arg->jsonSerialize();
+            }
+            if ($arg->value instanceof ConstFetch) { // single flag
+                $constFetch = $arg->value;
+            } else { // multiple flag
+                $result = $this->getFlags($array['left'], $result);
+                $constFetch = $array['right'];
+            }
+        }
+        if (!is_null($constFetch)) {
+            $result[] = $constFetch->jsonSerialize()['name']->getFirst();
+        }
+        return $result;
+    }
+
+    private function getArgWithFlags(array $flags): Arg|null
+    {
+        $oldNbFlags = count($flags);
+        $flags = array_values(array_unique([...$flags, ...self::FLAGS]));
+        $newNbFlags = count($flags);
+        if ($oldNbFlags === $newNbFlags) {
+            return null;
+        }
+        if ($newNbFlags === 1) {
+            return new Arg($this->createConstFetch($flags[0]));
+        }
+        /** @var ConstFetch[] $constFetchs */
+        $constFetchs = [];
+        foreach ($flags as $flag) {
+            $constFetchs[] = $this->createConstFetch($flag);
+        }
+        $result = null;
+        foreach ($constFetchs as $i => $constFetch) {
+            if ($i === 1) {
+                continue;
+            }
+            if (is_null($result)) {
+                $result = new Node\Expr\BinaryOp\BitwiseOr(
+                    $constFetch,
+                    $constFetchs[$i + 1],
+                );
+            } else {
+                $result = new Node\Expr\BinaryOp\BitwiseOr(
+                    $result,
+                    $constFetch
+                );
+            }
+        }
+        return new Arg($result);
+    }
 }