diff --git a/Lib/test/test_fstring.py b/Lib/test/test_fstring.py
index 031b94d8d58a39..cbb03080f797bc 100644
--- a/Lib/test/test_fstring.py
+++ b/Lib/test/test_fstring.py
@@ -907,6 +907,9 @@ def test_backslashes_in_string_part(self):
with self.assertWarns(DeprecationWarning): # invalid escape sequence
value = eval(r"f'\{6*7}'")
self.assertEqual(value, '\\42')
+ with self.assertWarns(SyntaxWarning): # invalid escape sequence
+ value = eval(r"f'\g'")
+ self.assertEqual(value, '\\g')
self.assertEqual(f'\\{6*7}', '\\42')
self.assertEqual(fr'\{6*7}', '\\42')
diff --git a/Misc/NEWS.d/next/Core and Builtins/2023-06-14-22-52-06.gh-issue-105800.hdpPzZ.rst b/Misc/NEWS.d/next/Core and Builtins/2023-06-14-22-52-06.gh-issue-105800.hdpPzZ.rst
new file mode 100644
index 00000000000000..d6ef7b68b833c6
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2023-06-14-22-52-06.gh-issue-105800.hdpPzZ.rst
@@ -0,0 +1,2 @@
+Correctly issue :exc:`SyntaxWarning` in f-strings if invalid sequences are
+used. Patch by Pablo Galindo
diff --git a/Parser/action_helpers.c b/Parser/action_helpers.c
index 9f5135380db1b2..dbad56b5164b6f 100644
--- a/Parser/action_helpers.c
+++ b/Parser/action_helpers.c
@@ -1231,7 +1231,7 @@ _PyPegen_nonparen_genexp_in_call(Parser *p, expr_ty args, asdl_comprehension_seq
// Fstring stuff
static expr_ty
-_PyPegen_decode_fstring_part(Parser* p, int is_raw, expr_ty constant) {
+_PyPegen_decode_fstring_part(Parser* p, int is_raw, expr_ty constant, Token* token) {
assert(PyUnicode_CheckExact(constant->v.Constant.value));
const char* bstr = PyUnicode_AsUTF8(constant->v.Constant.value);
@@ -1247,7 +1247,7 @@ _PyPegen_decode_fstring_part(Parser* p, int is_raw, expr_ty constant) {
}
is_raw = is_raw || strchr(bstr, '\\') == NULL;
- PyObject *str = _PyPegen_decode_string(p, is_raw, bstr, len, NULL);
+ PyObject *str = _PyPegen_decode_string(p, is_raw, bstr, len, token);
if (str == NULL) {
_Pypegen_raise_decode_error(p);
return NULL;
@@ -1321,7 +1321,7 @@ _PyPegen_joined_str(Parser *p, Token* a, asdl_expr_seq* raw_expressions, Token*b
for (Py_ssize_t i = 0; i < n_items; i++) {
expr_ty item = asdl_seq_GET(expr, i);
if (item->kind == Constant_kind) {
- item = _PyPegen_decode_fstring_part(p, is_raw, item);
+ item = _PyPegen_decode_fstring_part(p, is_raw, item, b);
if (item == NULL) {
return NULL;
}
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