diff --git a/src/http/request.cr b/src/http/request.cr
index 12e2987deaf7..eefd5edaf3e8 100644
--- a/src/http/request.cr
+++ b/src/http/request.cr
@@ -285,7 +285,7 @@ class HTTP::Request
   end
 
   # Sets request's query component.
-  def query=(value : String) : String
+  def query=(value : String?) : String?
     uri.query = value
     update_query_params
     value