diff --git a/src/HttpClientMock/RealRequestFactory.php b/src/HttpClientMock/RealRequestFactory.php
index 0180944..48b5885 100644
--- a/src/HttpClientMock/RealRequestFactory.php
+++ b/src/HttpClientMock/RealRequestFactory.php
@@ -8,6 +8,7 @@
 use Riverline\MultiPartParser\StreamedPart;
 
 use function array_key_exists;
+use function array_merge;
 use function assert;
 use function explode;
 use function is_array;
@@ -19,6 +20,8 @@
 use function Safe\preg_match;
 use function Safe\rewind;
 use function str_contains;
+use function str_ends_with;
+use function str_replace;
 use function strpos;
 use function strtolower;
 use function substr;
@@ -157,7 +160,18 @@ private function parseEncodedParams(string $encodedParams): array
                 $value = '';
             }
 
-            $params[urldecode((string) $key)] = urldecode((string) $value);
+            $key = urldecode($key);
+            $value = urldecode($value);
+
+            if (str_ends_with($key, '[]')) {
+                $key = str_replace('[]', '', $key);
+                $value = array_merge(
+                    $params[$key] ?? [],
+                    [$value],
+                );
+            }
+
+            $params[$key] = $value;
         }
 
         return $params;
diff --git a/tests/HttpClientMock/RealRequestFactoryTest.php b/tests/HttpClientMock/RealRequestFactoryTest.php
index ec1117b..0a5a275 100644
--- a/tests/HttpClientMock/RealRequestFactoryTest.php
+++ b/tests/HttpClientMock/RealRequestFactoryTest.php
@@ -32,6 +32,26 @@ public function testBuildsRequestWithoutBody(): void
         self::assertSame(['foo' => 'bar'], $request->getJson());
     }
 
+    public function testBuildsRequestWithMultipleQueryParams(): void
+    {
+        $options = ['query_params' => ['name' => ['abc', 'def']]];
+        $request = ($this->realRequestFactory)('POST', 'https://service.com', $options);
+
+        self::assertSame('POST', $request->getMethod());
+        self::assertSame('https://service.com', $request->getUri());
+        self::assertSame(['name' => ['abc', 'def']], $request->getQueryParams());
+    }
+
+    public function testBuildsRequestWithMultipleQueryParamsInUri(): void
+    {
+        $options = [];
+        $request = ($this->realRequestFactory)('POST', 'https://service.com?name[]=abc&name[]=def', $options);
+
+        self::assertSame('POST', $request->getMethod());
+        self::assertSame('https://service.com', $request->getUri());
+        self::assertSame(['name' => ['abc', 'def']], $request->getQueryParams());
+    }
+
     public function testBuildsRequestWithJsonInBody(): void
     {
         $options = [