diff --git a/jwst/msaflagopen/msaflagopen_step.py b/jwst/msaflagopen/msaflagopen_step.py
index afe5f7b1b7..9e2cf3ffc1 100755
--- a/jwst/msaflagopen/msaflagopen_step.py
+++ b/jwst/msaflagopen/msaflagopen_step.py
@@ -1,5 +1,7 @@
 from stdatamodels.jwst import datamodels
 
+from stpipe.crds_client import reference_uri_to_cache_path
+
 from ..stpipe import Step
 from . import msaflag_open
 
@@ -51,7 +53,6 @@ def process(self, input):
 
 def create_reference_filename_dictionary(input_model):
     reffiles = {}
-    a = Step()
     reffiles['distortion'] = input_model.meta.ref_file.distortion.name
     reffiles['filteroffset'] = input_model.meta.ref_file.filteroffset.name
     reffiles['specwcs'] = input_model.meta.ref_file.filteroffset.name
@@ -72,5 +73,5 @@ def create_reference_filename_dictionary(input_model):
     # Convert from crds protocol to absolute filenames
     for key in reffiles.keys():
         if reffiles[key].startswith('crds://'):
-            reffiles[key] = a.reference_uri_to_cache_path(reffiles[key], input_model.crds_observatory)
+            reffiles[key] = reference_uri_to_cache_path(reffiles[key], input_model.crds_observatory)
     return reffiles
diff --git a/jwst/wavecorr/tests/test_wavecorr.py b/jwst/wavecorr/tests/test_wavecorr.py
index 5ff61fc241..d2e3d08ce6 100644
--- a/jwst/wavecorr/tests/test_wavecorr.py
+++ b/jwst/wavecorr/tests/test_wavecorr.py
@@ -7,6 +7,7 @@
 
 from stdatamodels.jwst import datamodels
 from stdatamodels.jwst.transforms import models
+from stpipe.crds_client import reference_uri_to_cache_path
 
 import jwst
 from jwst.assign_wcs import AssignWcsStep
@@ -59,7 +60,7 @@ def test_wavecorr():
     # test the round-tripping on the wavelength correction transform
     ref_name = im_wave.meta.ref_file.wavecorr.name
     freference = datamodels.WaveCorrModel(
-        WavecorrStep.reference_uri_to_cache_path(ref_name, im.crds_observatory))
+        reference_uri_to_cache_path(ref_name, im.crds_observatory))
 
     lam_uncorr = lam_before * 1e-6
     wave2wavecorr = wavecorr.calculate_wavelength_correction_transform(
@@ -160,7 +161,7 @@ def test_skipped():
 
     ref_name = outw.meta.ref_file.wavecorr.name
     reffile = datamodels.WaveCorrModel(
-        WavecorrStep.reference_uri_to_cache_path(ref_name, im.crds_observatory))
+        reference_uri_to_cache_path(ref_name, im.crds_observatory))
     source_xpos = 0.1
     aperture_name = 'S200A1'
     
@@ -262,10 +263,10 @@ def test_wavecorr_fs():
 
     # test the roundtripping on the wavelength correction transform
     ref_name = result.meta.ref_file.wavecorr.name
-    freference = datamodels.WaveCorrModel(WavecorrStep.reference_uri_to_cache_path(ref_name, im.crds_observatory))
+    freference = datamodels.WaveCorrModel(reference_uri_to_cache_path(ref_name, im.crds_observatory))
 
     lam_uncorr = lam_before * 1e-6
-    wave2wavecorr = wavecorr.calculate_wavelength_correction_transform(lam_uncorr, dispersion, 
+    wave2wavecorr = wavecorr.calculate_wavelength_correction_transform(lam_uncorr, dispersion,
                                                                        freference, slit.source_xpos, 'S200A1')
     lam_corr = wave2wavecorr(lam_uncorr)
     assert_allclose(lam_uncorr, wave2wavecorr.inverse(lam_corr))