diff --git a/python/Makefile b/python/Makefile
index f4f5d969f..d9ac8de19 100644
--- a/python/Makefile
+++ b/python/Makefile
@@ -199,6 +199,13 @@ endif
 $(call object_for,python/src/py/objmodule.c): SFLAGS += -DMP_QSTR_urandom="MP_QSTR_random"
 $(call object_for,python/src/extmod/modurandom.c): SFLAGS += -DMP_QSTR_urandom="MP_QSTR_random"
 
+# Rename usys to sys
+# In order to change the name of the micropython module 'usys' to 'usys'
+# (without altering micropython files), we redefined the macro MP_QSTR_usys
+# by DMP_QSTR_sys.
+$(call object_for,python/src/py/objmodule.c): SFLAGS += -DMP_QSTR_usys="MP_QSTR_sys"
+$(call object_for,python/src/extmod/modusys.c): SFLAGS += -DMP_QSTR_usys="MP_QSTR_sys"
+
 # Handle upward-growing stack
 # Some platforms such as emscripten have a stack that grows up. We've rewritten
 # the stack control file to handle this case.
diff --git a/python/port/genhdr/qstrdefs.in.h b/python/port/genhdr/qstrdefs.in.h
index 6962c720b..7b198582c 100644
--- a/python/port/genhdr/qstrdefs.in.h
+++ b/python/port/genhdr/qstrdefs.in.h
@@ -9,7 +9,8 @@
  * - "cat build/genhdr/qstrdefs.preprocessed.h|grep '^Q'|uniq". CAUTION: the
  *   order is important, don't sort.
  * - Insert the result below in the MicroPython QSTRs section
- * - remove "QSTR(urandom)" as we renamed it to random */
+ * - remove "QSTR(urandom)" as we renamed it to random 
+ * - remove "QSTR(usys)" as we renamed it to sys */
 
 // Global configuration
 QCFG(BYTES_IN_LEN, (1))
@@ -331,7 +332,7 @@ Q(union)
 Q(update)
 Q(upper)
 Q(random)
-Q(usys)
+Q(sys)
 Q(value)
 Q(values)
 Q(version)