diff --git a/crates/polars-io/src/json/mod.rs b/crates/polars-io/src/json/mod.rs
index 8314192a09a11..7b828cd69ae5f 100644
--- a/crates/polars-io/src/json/mod.rs
+++ b/crates/polars-io/src/json/mod.rs
@@ -118,10 +118,7 @@ pub struct JsonWriter<W: Write> {
     json_format: JsonFormat,
 }
 
-impl<W: Write> JsonWriter<W>
-where
-    W: Write + 'static,
-{
+impl<W: Write> JsonWriter<W> {
     pub fn with_json_format(mut self, format: JsonFormat) -> Self {
         self.json_format = format;
         self
diff --git a/py-polars/polars/lazyframe/frame.py b/py-polars/polars/lazyframe/frame.py
index cea08e43f4aa8..c2d0e46524e27 100644
--- a/py-polars/polars/lazyframe/frame.py
+++ b/py-polars/polars/lazyframe/frame.py
@@ -2191,6 +2191,7 @@ def sink_json(
             comm_subplan_elim=False,
             comm_subexpr_elim=False,
             streaming=True,
+            eager=False,
         )
         return lf.sink_json(
             path=path, json_format=json_format, maintain_order=maintain_order