diff --git a/py/modsys.c b/py/modsys.c
index 4886419d0..29fac7c31 100644
--- a/py/modsys.c
+++ b/py/modsys.c
@@ -34,6 +34,7 @@
 #include "py/stream.h"
 #include "py/smallint.h"
 #include "py/runtime.h"
+#include "py/persistentcode.h"
 
 #if MICROPY_PY_SYS_SETTRACE
 #include "py/objmodule.h"
@@ -66,22 +67,36 @@ STATIC const mp_obj_tuple_t mp_sys_implementation_version_info_obj = {
     3,
     { I(MICROPY_VERSION_MAJOR), I(MICROPY_VERSION_MINOR), I(MICROPY_VERSION_MICRO) }
 };
+#if MICROPY_PERSISTENT_CODE_LOAD
+#define SYS_IMPLEMENTATION_ELEMS \
+    MP_ROM_QSTR(MP_QSTR_micropython), \
+    MP_ROM_PTR(&mp_sys_implementation_version_info_obj), \
+    MP_ROM_INT(MPY_FILE_HEADER_INT)
+#else
+#define SYS_IMPLEMENTATION_ELEMS \
+    MP_ROM_QSTR(MP_QSTR_micropython), \
+    MP_ROM_PTR(&mp_sys_implementation_version_info_obj)
+#endif
 #if MICROPY_PY_ATTRTUPLE
-STATIC const qstr impl_fields[] = { MP_QSTR_name, MP_QSTR_version };
+STATIC const qstr impl_fields[] = {
+    MP_QSTR_name,
+    MP_QSTR_version,
+    #if MICROPY_PERSISTENT_CODE_LOAD
+    MP_QSTR_mpy,
+    #endif
+};
 STATIC MP_DEFINE_ATTRTUPLE(
     mp_sys_implementation_obj,
     impl_fields,
-    2,
-        MP_ROM_QSTR(MP_QSTR_micropython),
-        MP_ROM_PTR(&mp_sys_implementation_version_info_obj)
+    2 + MICROPY_PERSISTENT_CODE_LOAD,
+        SYS_IMPLEMENTATION_ELEMS
 );
 #else
 STATIC const mp_rom_obj_tuple_t mp_sys_implementation_obj = {
     {&mp_type_tuple},
-    2,
+    2 + MICROPY_PERSISTENT_CODE_LOAD,
     {
-        MP_ROM_QSTR(MP_QSTR_micropython),
-        MP_ROM_PTR(&mp_sys_implementation_version_info_obj),
+        SYS_IMPLEMENTATION_ELEMS
     }
 };
 #endif
diff --git a/py/persistentcode.h b/py/persistentcode.h
index a6978c2a3..07e018f8a 100644
--- a/py/persistentcode.h
+++ b/py/persistentcode.h
@@ -70,6 +70,10 @@
 #define MPY_FEATURE_ARCH (MP_NATIVE_ARCH_NONE)
 #endif
 
+// 16-bit little-endian integer with the second and third bytes of supported .mpy files
+#define MPY_FILE_HEADER_INT (MPY_VERSION \
+    | (MPY_FEATURE_ENCODE_FLAGS(MPY_FEATURE_FLAGS) | MPY_FEATURE_ENCODE_ARCH(MPY_FEATURE_ARCH)) << 8)
+
 enum {
     MP_NATIVE_ARCH_NONE = 0,
     MP_NATIVE_ARCH_X86,
diff --git a/tests/basics/sys1.py b/tests/basics/sys1.py
index ab9138024..095824afa 100644
--- a/tests/basics/sys1.py
+++ b/tests/basics/sys1.py
@@ -18,3 +18,9 @@ try:
 except AttributeError:
     # Effectively skip subtests
     print(True)
+
+if hasattr(sys.implementation, 'mpy'):
+    print(type(sys.implementation.mpy))
+else:
+    # Effectively skip subtests
+    print(int)