diff --git a/testsuite/MDAnalysisTests/analysis/test_encore.py b/testsuite/MDAnalysisTests/analysis/test_encore.py
index 3c0dac3b286..d6b56dabad3 100644
--- a/testsuite/MDAnalysisTests/analysis/test_encore.py
+++ b/testsuite/MDAnalysisTests/analysis/test_encore.py
@@ -159,7 +159,7 @@ def test_rmsd_matrix_with_superimposition(self):
             encore.confdistmatrix.set_rmsd_matrix_elements,
             selection="name CA",
             pairwise_align=True,
-            mass_weighted=True,
+            weights='mass',
             n_jobs=1)
 
         reference = rms.RMSD(self.ens1, select = "name CA")
@@ -182,7 +182,7 @@ def test_rmsd_matrix_without_superimposition(self):
             encore.confdistmatrix.set_rmsd_matrix_elements,
             selection=selection_string,
             pairwise_align=False,
-            mass_weighted=True,
+            weights='mass',
             n_jobs=1)
 
         print (repr(confdist_matrix.as_array()[0,:]))