diff --git a/Mac/Python/macapplication.c b/Mac/Python/macapplication.c
index 00287418826..d7b1e2e89d1 100644
--- a/Mac/Python/macapplication.c
+++ b/Mac/Python/macapplication.c
@@ -31,6 +31,9 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 extern void PyMac_InitApplication();
 
 main() {
+#if defined(__MWERKS__) && defined(USE_TK)
+	PyTk_InitGUSI();
+#endif
 #if defined(__MWERKS__) && defined(__CFM68K__)
 	printf("Hello, world!\n");
 #endif