diff --git a/watertap/unit_models/tests/test_thickener_unit.py b/watertap/unit_models/tests/test_thickener_unit.py
index 33622f340b..6acd8cebcb 100644
--- a/watertap/unit_models/tests/test_thickener_unit.py
+++ b/watertap/unit_models/tests/test_thickener_unit.py
@@ -921,6 +921,7 @@ def perturb_solution(m):
     )
 
 
+@pytest.mark.requires_idaes_solver
 @pytest.mark.unit
 def test_scaling_profiler_with_scalers():
     sp = ScalingProfiler(
@@ -955,6 +956,7 @@ def test_scaling_profiler_with_scalers():
     assert stream.getvalue() == expected
 
 
+@pytest.mark.requires_idaes_solver
 @pytest.mark.unit
 def test_scaling_profiler_with_iscale():
     sp = ScalingProfiler(