diff --git a/.changes/unreleased/Under the Hood-20230906-164901.yaml b/.changes/unreleased/Under the Hood-20230906-164901.yaml
new file mode 100644
index 00000000000..f309a24ccc3
--- /dev/null
+++ b/.changes/unreleased/Under the Hood-20230906-164901.yaml	
@@ -0,0 +1,6 @@
+kind: Under the Hood
+body: Add typing to __init__ in base.py
+time: 2023-09-06T16:49:01.150713+01:00
+custom:
+  Author: aranke
+  Issue: "8398"
diff --git a/core/dbt/task/base.py b/core/dbt/task/base.py
index 0aae0bd8851..3e7d7544578 100644
--- a/core/dbt/task/base.py
+++ b/core/dbt/task/base.py
@@ -193,7 +193,7 @@ def __init__(self, node):
 
 
 class BaseRunner(metaclass=ABCMeta):
-    def __init__(self, config, adapter, node, node_index, num_nodes):
+    def __init__(self, config, adapter, node, node_index, num_nodes) -> None:
         self.config = config
         self.adapter = adapter
         self.node = node