diff --git a/releasenotes/notes/fix-wait-typing-b26eecdb6cc0a1de.yaml b/releasenotes/notes/fix-wait-typing-b26eecdb6cc0a1de.yaml
new file mode 100644
index 0000000..3b560c3
--- /dev/null
+++ b/releasenotes/notes/fix-wait-typing-b26eecdb6cc0a1de.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Argument `wait` was improperly annotated, making mypy checks fail.
+    Now it's annotated as `typing.Union[wait_base, typing.Callable[["RetryCallState"], typing.Union[float, int]]]`
diff --git a/tenacity/wait.py b/tenacity/wait.py
index 7a793b2..e1e2fe4 100644
--- a/tenacity/wait.py
+++ b/tenacity/wait.py
@@ -41,7 +41,7 @@
         return self.__add__(other)
 
 
-WaitBaseT = typing.Union[wait_base, typing.Callable[["RetryCallState"], bool]]
+WaitBaseT = typing.Union[wait_base, typing.Callable[["RetryCallState"], typing.Union[float, int]]]
 
 
 class wait_fixed(wait_base):