diff --git a/ports/bare-arm/mpconfigport.h b/ports/bare-arm/mpconfigport.h
index 4567676580..7fd236bfba 100644
--- a/ports/bare-arm/mpconfigport.h
+++ b/ports/bare-arm/mpconfigport.h
@@ -21,6 +21,7 @@
 #define MICROPY_ERROR_REPORTING     (MICROPY_ERROR_REPORTING_TERSE)
 #define MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG (0)
 #define MICROPY_PY_ASYNC_AWAIT (0)
+#define MICROPY_PY_ASSIGN_EXPR      (0)
 #define MICROPY_PY_BUILTINS_BYTEARRAY (0)
 #define MICROPY_PY_BUILTINS_DICT_FROMKEYS (0)
 #define MICROPY_PY_BUILTINS_MEMORYVIEW (0)
diff --git a/ports/minimal/mpconfigport.h b/ports/minimal/mpconfigport.h
index c3bdf66c10..b34217f680 100644
--- a/ports/minimal/mpconfigport.h
+++ b/ports/minimal/mpconfigport.h
@@ -19,6 +19,7 @@
 #define MICROPY_ERROR_REPORTING     (MICROPY_ERROR_REPORTING_TERSE)
 #define MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG (0)
 #define MICROPY_PY_ASYNC_AWAIT      (0)
+#define MICROPY_PY_ASSIGN_EXPR      (0)
 #define MICROPY_PY_BUILTINS_BYTEARRAY (0)
 #define MICROPY_PY_BUILTINS_DICT_FROMKEYS (0)
 #define MICROPY_PY_BUILTINS_ENUMERATE (0)