diff --git a/api/adapter.c b/api/adapter.c
index bc166c6..8cdf4a9 100644
--- a/api/adapter.c
+++ b/api/adapter.c
@@ -1689,11 +1689,11 @@ WintunCreateAdapter(
     _In_z_count_c_(MAX_ADAPTER_NAME) const WCHAR *Name,
     _In_opt_ const GUID *RequestedGUID,
     _Out_ WINTUN_ADAPTER **Adapter,
-    _Inout_ BOOL *RebootRequired)
+    _Out_ BOOL *RebootRequired)
 {
     if (!ElevateToSystem())
         return LOG(WINTUN_LOG_ERR, L"Failed to impersonate SYSTEM user"), ERROR_ACCESS_DENIED;
-
+    *RebootRequired = FALSE;
     DWORD Result = ERROR_SUCCESS;
 #ifdef MAYBE_WOW64
     if (NativeMachine != IMAGE_FILE_PROCESS)
@@ -1848,11 +1848,12 @@ cleanupArgv:
 #endif
 
 WINTUN_STATUS WINAPI
-WintunDeleteAdapter(_In_ const WINTUN_ADAPTER *Adapter, _In_ BOOL ForceCloseSessions, _Inout_ BOOL *RebootRequired)
+WintunDeleteAdapter(_In_ const WINTUN_ADAPTER *Adapter, _In_ BOOL ForceCloseSessions, _Out_ BOOL *RebootRequired)
 {
     if (!ElevateToSystem())
         return LOG(WINTUN_LOG_ERR, L"Failed to impersonate SYSTEM user"), ERROR_ACCESS_DENIED;
 
+    *RebootRequired = FALSE;
     DWORD Result;
 #ifdef MAYBE_WOW64
     if (NativeMachine != IMAGE_FILE_PROCESS)
diff --git a/api/adapter.h b/api/adapter.h
index 628299a..541c437 100644
--- a/api/adapter.h
+++ b/api/adapter.h
@@ -111,10 +111,10 @@ WintunCreateAdapter(
     _In_z_count_c_(MAX_ADAPTER_NAME) const WCHAR *Name,
     _In_opt_ const GUID *RequestedGUID,
     _Out_ WINTUN_ADAPTER **Adapter,
-    _Inout_ BOOL *RebootRequired);
+    _Out_ BOOL *RebootRequired);
 
 /**
  * @copydoc WINTUN_DELETE_ADAPTER_FUNC
  */
 WINTUN_STATUS WINAPI
-WintunDeleteAdapter(_In_ const WINTUN_ADAPTER *Adapter, _In_ BOOL ForceCloseSessions, _Inout_ BOOL *RebootRequired);
+WintunDeleteAdapter(_In_ const WINTUN_ADAPTER *Adapter, _In_ BOOL ForceCloseSessions, _Out_ BOOL *RebootRequired);
diff --git a/api/rundll32.c b/api/rundll32.c
index d594723..a397501 100644
--- a/api/rundll32.c
+++ b/api/rundll32.c
@@ -105,7 +105,7 @@ VOID __stdcall CreateAdapter(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLine, int
         goto cleanup;
 
     WINTUN_ADAPTER *Adapter;
-    BOOL RebootRequired = FALSE;
+    BOOL RebootRequired;
     DWORD Result = WintunCreateAdapter(Argv[2], Argv[3], Argc > 4 ? &RequestedGUID : NULL, &Adapter, &RebootRequired);
     WCHAR GuidStr[MAX_GUID_STRING_LEN];
     WriteFormatted(
@@ -137,7 +137,7 @@ VOID __stdcall DeleteAdapter(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLine, int
     BOOL ForceCloseSessions = wcstoul(Argv[2], NULL, 10);
     if (FAILED(CLSIDFromString(Argv[3], &Adapter.CfgInstanceID)))
         goto cleanup;
-    BOOL RebootRequired = FALSE;
+    BOOL RebootRequired;
     WriteFormatted(
         STD_OUTPUT_HANDLE,
         L"%1!X! %2!X!",
@@ -167,7 +167,7 @@ VOID __stdcall DoThingsForDebugging(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLin
         { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef }
     };
     WINTUN_ADAPTER *Adapter;
-    BOOL RebootRequired = FALSE;
+    BOOL RebootRequired;
     assert(WintunCreateAdapter(L"Wintun", L"Test", &TestGuid, &Adapter, &RebootRequired) == ERROR_SUCCESS);
     assert(!RebootRequired);
     TUN_SESSION *Session;
diff --git a/api/wintun.h b/api/wintun.h
index b6e1663..7258caf 100644
--- a/api/wintun.h
+++ b/api/wintun.h
@@ -40,8 +40,7 @@ typedef void *WINTUN_ADAPTER_HANDLE;
  * @param Adapter       Pointer to a handle to receive the adapter handle. Must be released with
  *                      WintunFreeAdapter.
  *
- * @param RebootRequired  Pointer to a boolean flag to be set to TRUE in case SetupAPI suggests a reboot. Must be
- *                      initialised to FALSE manually before this function is called.
+ * @param RebootRequired  Pointer to a boolean flag to be set to TRUE in case SetupAPI suggests a reboot.
  *
  * @return ERROR_SUCCESS on success; Win32 error code otherwise.
  */
@@ -50,7 +49,7 @@ typedef WINTUN_STATUS(WINAPI *WINTUN_CREATE_ADAPTER_FUNC)(
     _In_z_count_c_(MAX_ADAPTER_NAME) const WCHAR *Name,
     _In_opt_ const GUID *RequestedGUID,
     _Out_ WINTUN_ADAPTER_HANDLE *Adapter,
-    _Inout_ BOOL *RebootRequired);
+    _Out_ BOOL *RebootRequired);
 
 /**
  * Deletes a Wintun adapter.
@@ -61,15 +60,14 @@ typedef WINTUN_STATUS(WINAPI *WINTUN_CREATE_ADAPTER_FUNC)(
  *                           with extreme care, as this is resource intensive and may put processes into an undefined
  *                           or unpredictable state. Most users should set this to FALSE.
  *
- * @param RebootRequired     Pointer to a boolean flag to be set to TRUE in case SetupAPI suggests a reboot. Must be
- *                           initialised to FALSE manually before this function is called.
+ * @param RebootRequired     Pointer to a boolean flag to be set to TRUE in case SetupAPI suggests a reboot.
  *
  * @return ERROR_SUCCESS on success or the adapter was not found; Win32 error code otherwise.
  */
 typedef WINTUN_STATUS(WINAPI *WINTUN_DELETE_ADAPTER_FUNC)(
     _In_ WINTUN_ADAPTER_HANDLE Adapter,
     _In_ BOOL ForceCloseSessions,
-    _Inout_ BOOL *RebootRequired);
+    _Out_ BOOL *RebootRequired);
 
 /**
  * Called by WintunEnumAdapters for each adapter in the pool.