diff --git a/Lib/test/test_fstring.py b/Lib/test/test_fstring.py
index 76dd9e89ca3..7fc37023828 100644
--- a/Lib/test/test_fstring.py
+++ b/Lib/test/test_fstring.py
@@ -921,6 +921,7 @@ x = (
                 "f'{:2}'",
                 "f'''{\t\f\r\n:a}'''",
                 "f'{:'",
+                "F'{[F'{:'}[F'{:'}]]]",
             ],
         )
 
diff --git a/Misc/NEWS.d/next/Core and Builtins/2024-07-19-15-28-05.gh-issue-122026.sta2Ca.rst b/Misc/NEWS.d/next/Core and Builtins/2024-07-19-15-28-05.gh-issue-122026.sta2Ca.rst
new file mode 100644
index 00000000000..2721a405a50
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2024-07-19-15-28-05.gh-issue-122026.sta2Ca.rst	
@@ -0,0 +1,2 @@
+Fix a bug that caused the tokenizer to not correctly identify mismatched
+parentheses inside f-strings in some situations. Patch by Pablo Galindo
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 703b3ec7a6b..3118fb19846 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -2607,6 +2607,9 @@ letter_quote:
 
     if (INSIDE_FSTRING(tok)) {
       current_tok->curly_bracket_depth--;
+      if (current_tok->curly_bracket_depth < 0) {
+        return MAKE_TOKEN(syntaxerror(tok, "f-string: unmatched '%c'", c));
+      }
       if (c == '}' && current_tok->curly_bracket_depth ==
                           current_tok->curly_bracket_expr_start_depth) {
         current_tok->curly_bracket_expr_start_depth--;