diff --git a/lib/httpx/plugins/aws_sigv4.rb b/lib/httpx/plugins/aws_sigv4.rb
index 143e5605..5144a1cd 100644
--- a/lib/httpx/plugins/aws_sigv4.rb
+++ b/lib/httpx/plugins/aws_sigv4.rb
@@ -153,8 +153,10 @@ module HTTPX
           end.new.merge(options)
         end
 
-        def load_dependencies(_klass)
+        def load_dependencies(klass)
           require "openssl"
+          klass.plugin(:expect)
+          klass.plugin(:compression)
         end
       end