diff --git a/src/Illuminate/Foundation/Testing/Concerns/MakesHttpRequests.php b/src/Illuminate/Foundation/Testing/Concerns/MakesHttpRequests.php
index 70a893b6ee20..6653157174db 100644
--- a/src/Illuminate/Foundation/Testing/Concerns/MakesHttpRequests.php
+++ b/src/Illuminate/Foundation/Testing/Concerns/MakesHttpRequests.php
@@ -351,7 +351,7 @@ public function seeJsonStructure(array $structure = null, $responseData = null)
             return $this->seeJson();
         }
 
-        if (! $responseData) {
+        if (is_null($responseData)) {
             $responseData = $this->decodeResponseJson();
         }