diff --git a/hrequests/client.py b/hrequests/client.py
index 5adb29d..11deb71 100644
--- a/hrequests/client.py
+++ b/hrequests/client.py
@@ -327,7 +327,7 @@ def build_request(
         elif isinstance(cookies, list):
             merge_cookies(self.cookies, list_to_cookiejar(cookies))
         elif isinstance(cookies, dict):
-            self.cookies.set_cookie(cookiejar_from_dict(cookies))
+            merge_cookies(self.cookies, cookiejar_from_dict(cookies))
 
         # turn cookie jar into dict