diff --git a/win/rfb_win32/Service.cxx b/win/rfb_win32/Service.cxx
index 2547277..982a5b3 100644
--- a/win/rfb_win32/Service.cxx
+++ b/win/rfb_win32/Service.cxx
@@ -384,7 +384,7 @@
 // -=- Registering and unregistering the service
 
 bool rfb::win32::registerService(const TCHAR* name, const TCHAR* desc,
-                                 int argc, const char* argv[]) {
+                                 int argc, char** argv) {
 
   // - Initialise the default service parameters
   const TCHAR* defaultcmdline;
diff --git a/win/rfb_win32/Service.h b/win/rfb_win32/Service.h
index 00abe10..198726c 100644
--- a/win/rfb_win32/Service.h
+++ b/win/rfb_win32/Service.h
@@ -105,7 +105,7 @@
     //     event source information, etc.
     // *** should really accept TCHAR argv
 
-    bool registerService(const TCHAR* name, const TCHAR* desc, int argc, const char* argv[]);
+    bool registerService(const TCHAR* name, const TCHAR* desc, int argc, char** argv);
     bool unregisterService(const TCHAR* name);
 
     bool startService(const TCHAR* name);