diff --git a/CurlHttpClient.php b/CurlHttpClient.php
index 9f9fbd0..ddc7f9d 100644
--- a/CurlHttpClient.php
+++ b/CurlHttpClient.php
@@ -319,7 +319,7 @@ public function stream($responses, float $timeout = null): ResponseStreamInterfa
         if ($responses instanceof CurlResponse) {
             $responses = [$responses];
         } elseif (!is_iterable($responses)) {
-            throw new \TypeError(sprintf('%s() expects parameter 1 to be an iterable of CurlResponse objects, "%s" given.', __METHOD__, \is_object($responses) ? \get_class($responses) : \gettype($responses)));
+            throw new \TypeError(sprintf('"%s()" expects parameter 1 to be an iterable of CurlResponse objects, "%s" given.', __METHOD__, \is_object($responses) ? \get_class($responses) : \gettype($responses)));
         }
 
         $active = 0;
diff --git a/MockHttpClient.php b/MockHttpClient.php
index 7e09e35..07d53cc 100644
--- a/MockHttpClient.php
+++ b/MockHttpClient.php
@@ -79,7 +79,7 @@ public function stream($responses, float $timeout = null): ResponseStreamInterfa
         if ($responses instanceof ResponseInterface) {
             $responses = [$responses];
         } elseif (!is_iterable($responses)) {
-            throw new \TypeError(sprintf('%s() expects parameter 1 to be an iterable of MockResponse objects, "%s" given.', __METHOD__, \is_object($responses) ? \get_class($responses) : \gettype($responses)));
+            throw new \TypeError(sprintf('"%s()" expects parameter 1 to be an iterable of MockResponse objects, "%s" given.', __METHOD__, \is_object($responses) ? \get_class($responses) : \gettype($responses)));
         }
 
         return new ResponseStream(MockResponse::stream($responses, $timeout));
diff --git a/NativeHttpClient.php b/NativeHttpClient.php
index 6665081..7745d85 100644
--- a/NativeHttpClient.php
+++ b/NativeHttpClient.php
@@ -238,7 +238,7 @@ public function stream($responses, float $timeout = null): ResponseStreamInterfa
         if ($responses instanceof NativeResponse) {
             $responses = [$responses];
         } elseif (!is_iterable($responses)) {
-            throw new \TypeError(sprintf('%s() expects parameter 1 to be an iterable of NativeResponse objects, "%s" given.', __METHOD__, \is_object($responses) ? \get_class($responses) : \gettype($responses)));
+            throw new \TypeError(sprintf('"%s()" expects parameter 1 to be an iterable of NativeResponse objects, "%s" given.', __METHOD__, \is_object($responses) ? \get_class($responses) : \gettype($responses)));
         }
 
         return new ResponseStream(NativeResponse::stream($responses, $timeout));