diff --git a/lib/puma/minissl.rb b/lib/puma/minissl.rb
index eea966f8cb..be1de84cce 100644
--- a/lib/puma/minissl.rb
+++ b/lib/puma/minissl.rb
@@ -59,7 +59,7 @@ def read_nonblock(size, *_)
                 IO.select(nil, [@socket.to_io])
               end
             elsif !data
-              return nil
+              raise EOFError
             else
               break
             end