diff --git a/Doc/c-api/iter.rst b/Doc/c-api/iter.rst
index 0224d37..a2992b3 100644
--- a/Doc/c-api/iter.rst
+++ b/Doc/c-api/iter.rst
@@ -29,7 +29,7 @@
        /* propagate error */
    }
 
-   while (item = PyIter_Next(iterator)) {
+   while ((item = PyIter_Next(iterator))) {
        /* do something with item */
        ...
        /* release reference when done */