diff --git a/crates/polars-plan/src/logical_plan/aexpr/schema.rs b/crates/polars-plan/src/logical_plan/aexpr/schema.rs
index 3f7b11613744..45e5f7c5cba4 100644
--- a/crates/polars-plan/src/logical_plan/aexpr/schema.rs
+++ b/crates/polars-plan/src/logical_plan/aexpr/schema.rs
@@ -1,7 +1,9 @@
 use super::*;
 
 fn float_type(field: &mut Field) {
-    if field.dtype.is_numeric() && !matches!(&field.dtype, DataType::Float32) {
+    if (field.dtype.is_numeric() || field.dtype == DataType::Boolean)
+        && field.dtype != DataType::Float32
+    {
         field.coerce(DataType::Float64)
     }
 }
diff --git a/py-polars/tests/unit/streaming/test_streaming_group_by.py b/py-polars/tests/unit/streaming/test_streaming_group_by.py
index 35715f18179c..c93ec2357ba5 100644
--- a/py-polars/tests/unit/streaming/test_streaming_group_by.py
+++ b/py-polars/tests/unit/streaming/test_streaming_group_by.py
@@ -80,7 +80,7 @@ def test_streaming_group_by_types() -> None:
             "str_sum": pl.String,
             "bool_first": pl.Boolean,
             "bool_last": pl.Boolean,
-            "bool_mean": pl.Boolean,
+            "bool_mean": pl.Float64,
             "bool_sum": pl.UInt32,
             "date_sum": pl.Date,
             "date_mean": pl.Date,