diff --git a/dlls/winhttp/tests/notification.c b/dlls/winhttp/tests/notification.c
index 510d9e7a3e7..e2bbb714fe9 100644
--- a/dlls/winhttp/tests/notification.c
+++ b/dlls/winhttp/tests/notification.c
@@ -1023,7 +1023,7 @@ START_TEST (notification)
     si.event = CreateEventW( NULL, 0, 0, NULL );
     si.port = 7533;
 
-    thread = CreateThread( NULL, 0, server_thread, (LPVOID)&si, 0, NULL );
+    thread = CreateThread( NULL, 0, server_thread, &si, 0, NULL );
     ok(thread != NULL, "failed to create thread %u\n", GetLastError());
 
     server_socket_available = CreateEventW( NULL, 0, 0, NULL );
diff --git a/dlls/winhttp/tests/winhttp.c b/dlls/winhttp/tests/winhttp.c
index eb7c7b54f80..b005514dfac 100644
--- a/dlls/winhttp/tests/winhttp.c
+++ b/dlls/winhttp/tests/winhttp.c
@@ -4842,7 +4842,7 @@ START_TEST (winhttp)
     si.event = CreateEventW(NULL, 0, 0, NULL);
     si.port = 7532;
 
-    thread = CreateThread(NULL, 0, server_thread, (LPVOID)&si, 0, NULL);
+    thread = CreateThread(NULL, 0, server_thread, &si, 0, NULL);
     ok(thread != NULL, "failed to create thread %u\n", GetLastError());
 
     ret = WaitForSingleObject(si.event, 10000);