diff --git a/sig/http.rbs b/sig/http.rbs
index 1cd30e70..00286ad5 100644
--- a/sig/http.rbs
+++ b/sig/http.rbs
@@ -1272,7 +1272,7 @@ module HTTP
       def size: () -> Integer
 
       # Rewinds the IO to the beginning
-      def rewind: () -> (Integer | void)
+      def rewind: () -> void
     end
 
     class Part