diff --git a/embed/firmware/mpconfigport.h b/embed/firmware/mpconfigport.h
index 06c50923..e6f125f8 100644
--- a/embed/firmware/mpconfigport.h
+++ b/embed/firmware/mpconfigport.h
@@ -33,7 +33,6 @@
 
 // stuff from py/mpconfig.h
 #define MICROPY_ENABLE_COMPILER     (0)
-#define MICROPY_CPYTHON_COMPAT      (0)
 
 // frozen modules
 #define MICROPY_MODULE_FROZEN_MPY   (1)
diff --git a/embed/unix/mpconfigport.h b/embed/unix/mpconfigport.h
index b4518086..995cca39 100644
--- a/embed/unix/mpconfigport.h
+++ b/embed/unix/mpconfigport.h
@@ -26,9 +26,6 @@
 
 // options to control how MicroPython is built
 
-// stuff from py/mpconfig.h
-#define MICROPY_CPYTHON_COMPAT      (0)
-
 #define MICROPY_ALLOC_PATH_MAX      (PATH_MAX)
 #define MICROPY_PERSISTENT_CODE_LOAD (1)
 #if !defined(MICROPY_EMIT_X64) && defined(__x86_64__)