diff --git a/py/lexer.c b/py/lexer.c
index ff137fbbb4..a9444645a0 100644
--- a/py/lexer.c
+++ b/py/lexer.c
@@ -731,7 +731,7 @@ STATIC void mp_lexer_next_token_into(mp_lexer_t *lex, mp_token_t *tok, bool firs
 }
 
 mp_lexer_t *mp_lexer_new(qstr src_name, void *stream_data, mp_lexer_stream_next_byte_t stream_next_byte, mp_lexer_stream_close_t stream_close) {
-    mp_lexer_t *lex = m_new_maybe(mp_lexer_t, 1);
+    mp_lexer_t *lex = m_new_obj_maybe(mp_lexer_t);
 
     // check for memory allocation error
     if (lex == NULL) {
diff --git a/py/lexerstr.c b/py/lexerstr.c
index 3a68441107..a1f7ce41d0 100644
--- a/py/lexerstr.c
+++ b/py/lexerstr.c
@@ -52,7 +52,7 @@ STATIC void str_buf_free(mp_lexer_str_buf_t *sb) {
 }
 
 mp_lexer_t *mp_lexer_new_from_str_len(qstr src_name, const char *str, mp_uint_t len, mp_uint_t free_len) {
-    mp_lexer_str_buf_t *sb = m_new_maybe(mp_lexer_str_buf_t, 1);
+    mp_lexer_str_buf_t *sb = m_new_obj_maybe(mp_lexer_str_buf_t);
     if (sb == NULL) {
         return NULL;
     }
diff --git a/py/lexerunix.c b/py/lexerunix.c
index 9d669f2bfe..52eac9eda5 100644
--- a/py/lexerunix.c
+++ b/py/lexerunix.c
@@ -69,7 +69,10 @@ STATIC void file_buf_close(mp_lexer_file_buf_t *fb) {
 }
 
 mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
-    mp_lexer_file_buf_t *fb = m_new_obj(mp_lexer_file_buf_t);
+    mp_lexer_file_buf_t *fb = m_new_obj_maybe(mp_lexer_file_buf_t);
+    if (fb == NULL) {
+        return NULL;
+    }
     fb->fd = open(filename, O_RDONLY);
     if (fb->fd < 0) {
         m_del_obj(mp_lexer_file_buf_t, fb);
diff --git a/py/misc.h b/py/misc.h
index d828998cfd..2f53dcbd3d 100644
--- a/py/misc.h
+++ b/py/misc.h
@@ -54,6 +54,7 @@ typedef unsigned int uint;
 #define m_new_maybe(type, num) ((type*)(m_malloc_maybe(sizeof(type) * (num))))
 #define m_new0(type, num) ((type*)(m_malloc0(sizeof(type) * (num))))
 #define m_new_obj(type) (m_new(type, 1))
+#define m_new_obj_maybe(type) (m_new_maybe(type, 1))
 #define m_new_obj_var(obj_type, var_type, var_num) ((obj_type*)m_malloc(sizeof(obj_type) + sizeof(var_type) * (var_num)))
 #define m_new_obj_var_maybe(obj_type, var_type, var_num) ((obj_type*)m_malloc_maybe(sizeof(obj_type) + sizeof(var_type) * (var_num)))
 #if MICROPY_ENABLE_FINALISER
diff --git a/stmhal/lexerfatfs.c b/stmhal/lexerfatfs.c
index 21e3a2007e..ea47aaf884 100644
--- a/stmhal/lexerfatfs.c
+++ b/stmhal/lexerfatfs.c
@@ -64,7 +64,10 @@ STATIC void file_buf_close(mp_lexer_file_buf_t *fb) {
 }
 
 mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
-    mp_lexer_file_buf_t *fb = m_new_obj(mp_lexer_file_buf_t);
+    mp_lexer_file_buf_t *fb = m_new_obj_maybe(mp_lexer_file_buf_t);
+    if (fb == NULL) {
+        return NULL;
+    }
     FRESULT res = f_open(&fb->fp, filename, FA_READ);
     if (res != FR_OK) {
         m_del_obj(mp_lexer_file_buf_t, fb);