diff --git a/src/gpgme-w32spawn.c b/src/gpgme-w32spawn.c
index 64913b01..d6de2cc2 100644
--- a/src/gpgme-w32spawn.c
+++ b/src/gpgme-w32spawn.c
@@ -243,7 +243,7 @@ my_spawn (char **argv, struct spawn_fd_item_s *fd_list, unsigned int flags)
           handle = LoadLibrary ("user32.dll");
           if (handle)
             {
-              func = GetProcAddress (handle, "AllowSetForegroundWindow");
+              func = (BOOL (*)(DWORD)) GetProcAddress (handle, "AllowSetForegroundWindow");
               if (!func)
                 FreeLibrary (handle);
             }