diff --git a/ports/sh/numworks/ion.c b/ports/sh/numworks/ion.c
index b86315d19..ea7e4cc30 100644
--- a/ports/sh/numworks/ion.c
+++ b/ports/sh/numworks/ion.c
@@ -1,3 +1,5 @@
+#ifdef FXCG50
+
 //---------------------------------------------------------------------------//
 //    ____        PythonExtra                                                //
 //.-'`_ o `;__,   A community port of MicroPython for CASIO calculators.     //
@@ -172,3 +174,5 @@ const mp_obj_module_t ion_module = {
 };
 
 MP_REGISTER_MODULE(MP_QSTR_ion, ion_module);
+
+#endif // FXCG50
\ No newline at end of file
diff --git a/ports/sh/numworks/modkandinsky.c b/ports/sh/numworks/modkandinsky.c
index 453933796..9407f5ab0 100644
--- a/ports/sh/numworks/modkandinsky.c
+++ b/ports/sh/numworks/modkandinsky.c
@@ -1,3 +1,5 @@
+#ifdef FXCG50
+
 //---------------------------------------------------------------------------//
 //    ____        PythonExtra                                                //
 //.-'`_ o `;__,   A community port of MicroPython for CASIO calculators.     //
@@ -299,3 +301,5 @@ const mp_obj_module_t kandinsky_module = {
 };
 
 MP_REGISTER_MODULE(MP_QSTR_kandinsky, kandinsky_module);
+
+#endif //FXCG50
\ No newline at end of file
diff --git a/ports/sh/numworks/time.c b/ports/sh/numworks/time.c
index debcdd0ec..157c1eaee 100644
--- a/ports/sh/numworks/time.c
+++ b/ports/sh/numworks/time.c
@@ -1,3 +1,5 @@
+#ifdef FXCG50
+
 //---------------------------------------------------------------------------//
 //    ____        PythonExtra                                                //
 //.-'`_ o `;__,   A community port of MicroPython for CASIO calculators.     //
@@ -109,3 +111,5 @@ const mp_obj_module_t time_module = {
 };
 
 MP_REGISTER_MODULE(MP_QSTR_time, time_module);
+
+#endif //FXCG50
\ No newline at end of file