diff --git a/pytket/extensions/qiskit/qiskit_convert.py b/pytket/extensions/qiskit/qiskit_convert.py
index f294296d..83fe007f 100644
--- a/pytket/extensions/qiskit/qiskit_convert.py
+++ b/pytket/extensions/qiskit/qiskit_convert.py
@@ -788,17 +788,17 @@ def _get_qiskit_control_state(bool_list: list[bool]) -> str:
 
 def _param_to_tk(p: float | ParameterExpression) -> sympy.Expr:
     if isinstance(p, ParameterExpression):
-        return sympy.sympify(str(p)) / sympy.pi
+        return p.sympify() / sympy.pi
     return p / sympy.pi
 
 
 def _param_to_qiskit(
     p: sympy.Expr, symb_map: dict[Parameter, sympy.Symbol]
 ) -> float | ParameterExpression | Parameter:
-    ppi = p * sympy.pi
+    ppi = sympify(p) * sympy.pi
     if len(ppi.free_symbols) == 0:
         return float(ppi.evalf())
-    return Parameter(str(sympify(ppi)))
+    return Parameter(sympify(ppi))
 
 
 def _get_params(
@@ -1192,6 +1192,7 @@ def tk_to_qiskit(
         name_spl = p.name.split("_UUID_", 2)
         if len(name_spl) == 2:  # noqa: PLR2004
             p_name, uuid_str = name_spl
+            print(uuid_str)
             uuid = UUID(uuid_str)
             # See Parameter.__init__() in qiskit/circuit/parameter.py.
             new_p = Parameter(p_name, uuid=uuid)
diff --git a/tests/qiskit_convert_test.py b/tests/qiskit_convert_test.py
index 27b4f717..1d4c5bbd 100644
--- a/tests/qiskit_convert_test.py
+++ b/tests/qiskit_convert_test.py
@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+import json
 import os
 import warnings
 from collections import Counter
@@ -823,6 +824,49 @@ def test_convert_multi_c_reg() -> None:
     assert circ.get_commands()[1].args == [Bit("tk_SCRATCH_BIT", 0), q1]
 
 
+def test_convert_symbolic_circ() -> None:
+    with open(
+            "sympy_qiskit_issue1.json"
+        ) as f:
+        circ = Circuit.from_dict(json.load(f))
+        for g in circ:
+            print(g)  # noqa: T201
+
+    from pytket.extensions.qiskit.qiskit_convert import (  # noqa: PLC0415
+        qiskit_to_tk,
+        tk_to_qiskit,
+    )
+
+    qc = tk_to_qiskit(circ)
+
+    print(qc)  # noqa: T201
+
+    tc = qiskit_to_tk(qc)
+
+    print(tc)  # noqa: T201
+
+
+def test_convert_symbolic_circ_2() -> None:
+    with open(
+            "sympy_qiskit_issue2.json"
+        ) as f:
+        circ = Circuit.from_dict(json.load(f))
+        for g in circ:
+            print(g)  # noqa: T201
+
+    from pytket.extensions.qiskit.qiskit_convert import (  # noqa: PLC0415
+        qiskit_to_tk,
+        tk_to_qiskit,
+    )
+
+    qc = tk_to_qiskit(circ)
+
+    print(qc)  # noqa: T201
+
+    tc = qiskit_to_tk(qc)
+
+    print(tc)  # noqa: T201
+
 # test that tk_to_qiskit works after adding OpType.CRx and OpType.CRy
 def test_crx_and_cry() -> None:
     tk_circ = Circuit(2)