diff --git a/reactos/include/reactos/win32k/ntuser.h b/reactos/include/reactos/win32k/ntuser.h
index f290c3b783d..0c6c51491f7 100644
--- a/reactos/include/reactos/win32k/ntuser.h
+++ b/reactos/include/reactos/win32k/ntuser.h
@@ -991,11 +991,11 @@ NTAPI
 NtUserGetClipCursor(
   RECT *lpRect);
 
-DWORD
+BOOL
 NTAPI
 NtUserGetComboBoxInfo(
-  DWORD Unknown0,
-  DWORD Unknown1);
+  HWND hWnd,
+  PCOMBOBOXINFO pcbi);
 
 DWORD
 NTAPI
diff --git a/reactos/subsystems/win32/win32k/ntuser/ntstubs.c b/reactos/subsystems/win32/win32k/ntuser/ntstubs.c
index 3d69740056e..3474755d8a3 100644
--- a/reactos/subsystems/win32/win32k/ntuser/ntstubs.c
+++ b/reactos/subsystems/win32/win32k/ntuser/ntstubs.c
@@ -272,11 +272,11 @@ NtUserGetAltTabInfo(
    return 0;
 }
 
-DWORD
+BOOL
 STDCALL
 NtUserGetComboBoxInfo(
-   DWORD Unknown0,
-   DWORD Unknown1)
+   HWND hWnd,
+   PCOMBOBOXINFO pcbi)
 {
    UNIMPLEMENTED