diff --git a/glue/sample/src/sinter/_data/_anon_task_stats.py b/glue/sample/src/sinter/_data/_anon_task_stats.py
index 42281c07d..a303d5ea1 100644
--- a/glue/sample/src/sinter/_data/_anon_task_stats.py
+++ b/glue/sample/src/sinter/_data/_anon_task_stats.py
@@ -40,6 +40,16 @@ def __post_init__(self):
         assert isinstance(self.discards, (int, np.integer))
         assert isinstance(self.seconds, (int, float, np.integer, np.floating))
         assert isinstance(self.custom_counts, collections.Counter)
+
+        if isinstance(self.errors, np.integer):
+            object.__setattr__(self, 'errors', int(self.errors))
+        if isinstance(self.shots, np.integer):
+            object.__setattr__(self, 'shots', int(self.shots))
+        if isinstance(self.discards, np.integer):
+            object.__setattr__(self, 'discards', int(self.discards))
+        if isinstance(self.seconds, (np.integer, np.floating)):
+            object.__setattr__(self, 'seconds', float(self.seconds))
+
         assert self.errors >= 0
         assert self.discards >= 0
         assert self.seconds >= 0
diff --git a/glue/sample/src/sinter/_data/_anon_task_stats_test.py b/glue/sample/src/sinter/_data/_anon_task_stats_test.py
index 3b2e0b0b7..1145745dc 100644
--- a/glue/sample/src/sinter/_data/_anon_task_stats_test.py
+++ b/glue/sample/src/sinter/_data/_anon_task_stats_test.py
@@ -1,4 +1,5 @@
 import collections
+import numpy as np
 
 import sinter
 
@@ -33,3 +34,11 @@ def test_add():
 
     assert a + b0 == sinter.AnonTaskStats(shots=270, errors=34, discards=43, seconds=52, custom_counts=collections.Counter({'a': 10, 'b': 20}))
     assert a0 + b == sinter.AnonTaskStats(shots=270, errors=34, discards=43, seconds=52, custom_counts=collections.Counter({'a': 1, 'c': 3}))
+
+def test_init_handles_np():
+    a0 = sinter.AnonTaskStats(shots=np.int64(220), errors=np.int64(0), discards=np.int64(0), seconds=np.float64(0.0), custom_counts=collections.Counter({'a': 10, 'b': 20}))
+
+    assert isinstance(a0.shots, int)
+    assert isinstance(a0.errors, int)
+    assert isinstance(a0.discards, int)
+    assert isinstance(a0.seconds, float)
diff --git a/glue/sample/src/sinter/_data/_task_stats.py b/glue/sample/src/sinter/_data/_task_stats.py
index f184e94d6..3512798b9 100644
--- a/glue/sample/src/sinter/_data/_task_stats.py
+++ b/glue/sample/src/sinter/_data/_task_stats.py
@@ -79,6 +79,16 @@ def __post_init__(self):
         assert isinstance(self.decoder, str)
         assert isinstance(self.strong_id, str)
         assert self.json_metadata is None or isinstance(self.json_metadata, (int, float, str, dict, list, tuple))
+
+        if isinstance(self.errors, np.integer):
+            object.__setattr__(self, 'errors', int(self.errors))
+        if isinstance(self.shots, np.integer):
+            object.__setattr__(self, 'shots', int(self.shots))
+        if isinstance(self.discards, np.integer):
+            object.__setattr__(self, 'discards', int(self.discards))
+        if isinstance(self.seconds, (np.integer, np.floating)):
+            object.__setattr__(self, 'seconds', float(self.seconds))
+
         assert self.errors >= 0
         assert self.discards >= 0
         assert self.seconds >= 0
diff --git a/glue/sample/src/sinter/_data/_task_stats_test.py b/glue/sample/src/sinter/_data/_task_stats_test.py
index 79f456f2a..1b928d77c 100644
--- a/glue/sample/src/sinter/_data/_task_stats_test.py
+++ b/glue/sample/src/sinter/_data/_task_stats_test.py
@@ -1,4 +1,5 @@
 import collections
+import numpy as np
 
 import pytest
 
@@ -138,3 +139,19 @@ def test_is_equal_json_values():
     assert not _is_equal_json_values({'x': (1, 2)}, {'x': (1, 3)})
     assert not _is_equal_json_values(1, 2)
     assert _is_equal_json_values(1, 1)
+
+def test_init_handles_np():
+    v = sinter.TaskStats(
+        strong_id='test',
+        json_metadata={'a': [1, 2, 3]},
+        decoder='pymatching',
+        shots=np.int64(22),
+        errors=np.int64(3),
+        discards=np.int64(4),
+        seconds=np.float64(5),
+    )
+
+    assert isinstance(v.shots, int)
+    assert isinstance(v.errors, int)
+    assert isinstance(v.discards, int)
+    assert isinstance(v.seconds, float)