diff --git a/stubs/psutil/psutil/__init__.pyi b/stubs/psutil/psutil/__init__.pyi
index b49b1a1fb3d4..af2db20b439f 100644
--- a/stubs/psutil/psutil/__init__.pyi
+++ b/stubs/psutil/psutil/__init__.pyi
@@ -177,7 +177,13 @@ class Process:
         @overload
         def cpu_affinity(self, cpus: list[int]) -> None: ...
 
-        def memory_maps(self, grouped: bool = True) -> list[Incomplete]: ...
+        @overload
+        def memory_maps(self, grouped: Literal[True] = True) -> list[_ntp.pmmap_grouped]: ...
+        @overload
+        def memory_maps(self, grouped: Literal[False]) -> list[_ntp.pmmap_ext]: ...
+        @overload
+        def memory_maps(self, grouped: bool) -> list[_ntp.pmmap_grouped] | list[_ntp.pmmap_ext]: ...
+
     if sys.platform == "linux":
         def rlimit(self, resource: int, limits: tuple[int, int] | None = None) -> tuple[int, int]: ...
         def cpu_num(self) -> int: ...