diff --git a/tests/integration/dbapi/async/V2/test_queries_async.py b/tests/integration/dbapi/async/V2/test_queries_async.py
index fa8dc0ab12..e16c7808f0 100644
--- a/tests/integration/dbapi/async/V2/test_queries_async.py
+++ b/tests/integration/dbapi/async/V2/test_queries_async.py
@@ -598,3 +598,27 @@ async def test_fb_numeric_paramstyle_incorrect_params(
         assert "Query referenced positional parameter $34, but it was not set" in str(
             exc_info.value
         )
+
+
+async def test_select_quoted_decimal(
+    connection: Connection, long_decimal_value: str, long_value_decimal_sql: str
+):
+    async with connection.cursor() as c:
+        await c.execute(long_value_decimal_sql)
+        result = await c.fetchall()
+        assert len(result) == 1, "Invalid data length returned by fetchall"
+        assert result[0][0] == Decimal(
+            long_decimal_value
+        ), "Invalid data returned by fetchall"
+
+
+async def test_select_quoted_bigint(
+    connection: Connection, long_bigint_value: str, long_value_bigint_sql: str
+):
+    async with connection.cursor() as c:
+        await c.execute(long_value_bigint_sql)
+        result = await c.fetchall()
+        assert len(result) == 1, "Invalid data length returned by fetchall"
+        assert result[0][0] == int(
+            long_bigint_value
+        ), "Invalid data returned by fetchall"
diff --git a/tests/integration/dbapi/conftest.py b/tests/integration/dbapi/conftest.py
index 015ab0cb1d..6ec89708a8 100644
--- a/tests/integration/dbapi/conftest.py
+++ b/tests/integration/dbapi/conftest.py
@@ -273,3 +273,23 @@ def select_struct_description() -> List[Column]:
 @fixture
 def select_struct_response() -> List[ColType]:
     return [[{"id": 1, "s": {"a": [1, 2], "b": datetime(2019, 7, 31, 1, 1, 1)}}]]
+
+
+@fixture
+def long_decimal_value() -> str:
+    return "1234567890123456789012345678901234567.0"
+
+
+@fixture
+def long_value_decimal_sql(long_decimal_value: str) -> str:
+    return f"SELECT '{long_decimal_value}'::decimal(38, 1)"
+
+
+@fixture
+def long_bigint_value() -> str:
+    return "123456789012345678"
+
+
+@fixture
+def long_value_bigint_sql(long_bigint_value: str) -> str:
+    return f"SELECT '{long_bigint_value}'::bigint"
diff --git a/tests/integration/dbapi/sync/V2/test_queries.py b/tests/integration/dbapi/sync/V2/test_queries.py
index 46e140ba8e..9b415cef88 100644
--- a/tests/integration/dbapi/sync/V2/test_queries.py
+++ b/tests/integration/dbapi/sync/V2/test_queries.py
@@ -673,3 +673,27 @@ def test_fb_numeric_paramstyle_incorrect_params(
         assert "Query referenced positional parameter $34, but it was not set" in str(
             exc_info.value
         )
+
+
+def test_select_quoted_decimal(
+    connection: Connection, long_decimal_value: str, long_value_decimal_sql: str
+):
+    with connection.cursor() as c:
+        c.execute(long_value_decimal_sql)
+        result = c.fetchall()
+        assert len(result) == 1, "Invalid data length returned by fetchall"
+        assert result[0][0] == Decimal(
+            long_decimal_value
+        ), "Invalid data returned by fetchall"
+
+
+def test_select_quoted_bigint(
+    connection: Connection, long_bigint_value: str, long_value_bigint_sql: str
+):
+    with connection.cursor() as c:
+        c.execute(long_value_bigint_sql)
+        result = c.fetchall()
+        assert len(result) == 1, "Invalid data length returned by fetchall"
+        assert result[0][0] == int(
+            long_bigint_value
+        ), "Invalid data returned by fetchall"
diff --git a/tests/unit/common/test_typing_parse.py b/tests/unit/common/test_typing_parse.py
index 67289b09c2..42b224b1d4 100644
--- a/tests/unit/common/test_typing_parse.py
+++ b/tests/unit/common/test_typing_parse.py
@@ -53,6 +53,7 @@ def test_parse_struct_type_with_spaces() -> None:
         ((1,), None, TypeError),
         ([1], None, TypeError),
         (Exception(), None, TypeError),
+        ("123456789012345678", 123456789012345678, None),
     ],
 )
 def test_parse_value_int(value, expected, error) -> None:
@@ -220,6 +221,10 @@ def test_parse_value_datetime_errors() -> None:
         ("123.456", Decimal("123.456")),
         (123, Decimal("123")),
         (None, None),
+        (
+            "1234567890123456789012345678901234567.0",
+            Decimal("1234567890123456789012345678901234567.0"),
+        ),
     ],
 )
 def test_parse_decimal(value, expected) -> None: