diff --git a/tests/regression_tests/tallies/inputs_true.dat b/tests/regression_tests/tallies/inputs_true.dat
index 5e49d6a23..bc9efe97e 100644
--- a/tests/regression_tests/tallies/inputs_true.dat
+++ b/tests/regression_tests/tallies/inputs_true.dat
@@ -425,18 +425,22 @@
   <tally id="15">
     <filters>10</filters>
     <scores>scatter nu-scatter</scores>
+    <estimator>analog</estimator>
   </tally>
   <tally id="16">
     <filters>11</filters>
     <scores>scatter nu-scatter flux total</scores>
+    <estimator>analog</estimator>
   </tally>
   <tally id="17">
     <filters>11</filters>
     <scores>flux total</scores>
+    <estimator>collision</estimator>
   </tally>
   <tally id="18">
     <filters>11</filters>
     <scores>flux total</scores>
+    <estimator>tracklength</estimator>
   </tally>
   <tally id="19">
     <filters>12</filters>
diff --git a/tests/regression_tests/tallies/results_true.dat b/tests/regression_tests/tallies/results_true.dat
index 6c56ab67a..6aa4d34f8 100644
--- a/tests/regression_tests/tallies/results_true.dat
+++ b/tests/regression_tests/tallies/results_true.dat
@@ -1 +1 @@
-ba4369130ac65812939cb417c7088ae6c8cdec118fd7dce5645b40a20a3ae47072cd72c24aa091ccc09f833a5bfc0bd72407a0dcde7d3120e39379942614a75b
\ No newline at end of file
+8f03bf00960a26cce719d6750746f1c99956c0173f01e10f99a246d2c254cbcd47ae98437bdf08532e4122c381b7e164f8f3c1e6f65f883684ce1e87e531443f
\ No newline at end of file
diff --git a/tests/regression_tests/tallies/test.py b/tests/regression_tests/tallies/test.py
index 1f404134f..fce84ae45 100644
--- a/tests/regression_tests/tallies/test.py
+++ b/tests/regression_tests/tallies/test.py
@@ -103,23 +103,23 @@ def test_tallies():
     legendre_tally = Tally()
     legendre_tally.filters = [legendre_filter]
     legendre_tally.scores = ['scatter', 'nu-scatter']
-    legendre_tally.estimatir = 'analog'
+    legendre_tally.estimator = 'analog'
 
     harmonics_filter = SphericalHarmonicsFilter(order=4)
     harmonics_tally = Tally()
     harmonics_tally.filters = [harmonics_filter]
     harmonics_tally.scores = ['scatter', 'nu-scatter', 'flux', 'total']
-    harmonics_tally.estimatir = 'analog'
+    harmonics_tally.estimator = 'analog'
 
     harmonics_tally2 = Tally()
     harmonics_tally2.filters = [harmonics_filter]
     harmonics_tally2.scores = ['flux', 'total']
-    harmonics_tally2.estimatir = 'collision'
+    harmonics_tally2.estimator = 'collision'
 
     harmonics_tally3 = Tally()
     harmonics_tally3.filters = [harmonics_filter]
     harmonics_tally3.scores = ['flux', 'total']
-    harmonics_tally3.estimatir = 'tracklength'
+    harmonics_tally3.estimator = 'tracklength'
 
     universe_tally = Tally()
     universe_tally.filters = [