diff --git a/Spryker/Traits/SignatureTrait.php b/Spryker/Traits/SignatureTrait.php
index e2b4c668..2a5b8b66 100644
--- a/Spryker/Traits/SignatureTrait.php
+++ b/Spryker/Traits/SignatureTrait.php
@@ -57,12 +57,24 @@ protected function getMethodSignature(File $phpCsFile, int $stackPtr): array
                 $typehint = substr($typehint, 1);
             }
 
+            // Determine if parameter accepts null (nullable or explicit null)
+            $nullable = $parameter['nullable_type'];
+            if ($nullable === false && $typehint != '') {
+                for ($i = $parameter['type_hint_token']; $i <= $parameter['type_hint_end_token']; $i++) {
+                    if ($tokens[$i]['code'] === T_NULL) {
+                        $nullable = true;
+
+                        break;
+                    }
+                }
+            }
+
             $arguments[] = [
                 'variableIndex' => $parameter['token'],
                 'variable' => $parameter['name'],
                 'typehint' => $typehint,
                 'typehintFull' => $parameter['type_hint'],
-                'nullable' => $parameter['nullable_type'],
+                'nullable' => $nullable,
                 'defaultIndex' => $defaultIndex,
                 'default' => $default,
             ];
diff --git a/tests/_data/DocBlockParamAllowDefaultValue/after.php b/tests/_data/DocBlockParamAllowDefaultValue/after.php
index d7817442..d3c1fe3d 100644
--- a/tests/_data/DocBlockParamAllowDefaultValue/after.php
+++ b/tests/_data/DocBlockParamAllowDefaultValue/after.php
@@ -67,4 +67,14 @@ public function registerTableMapClass(string $tableMapClass): void
     public function toPHP(mixed $value): mixed {
         return $value;
     }
+
+    /**
+     * This typehint is correct and should not change. See issue #368.
+     *
+     * @param int|string|null $value
+     * @return void
+     */
+    public function multipleUnion(int|string|null $value): void
+    {
+    }
 }
diff --git a/tests/_data/DocBlockParamAllowDefaultValue/before.php b/tests/_data/DocBlockParamAllowDefaultValue/before.php
index d5d9216f..65bb99af 100644
--- a/tests/_data/DocBlockParamAllowDefaultValue/before.php
+++ b/tests/_data/DocBlockParamAllowDefaultValue/before.php
@@ -67,4 +67,14 @@ public function registerTableMapClass(string $tableMapClass): void
     public function toPHP(mixed $value): mixed {
         return $value;
     }
+
+    /**
+     * This typehint is correct and should not change. See issue #368.
+     *
+     * @param int|string|null $value
+     * @return void
+     */
+    public function multipleUnion(int|string|null $value): void
+    {
+    }
 }