diff --git a/satpy/readers/abi_l1b.py b/satpy/readers/abi_l1b.py
index f92f2c7812..88532934a6 100644
--- a/satpy/readers/abi_l1b.py
+++ b/satpy/readers/abi_l1b.py
@@ -40,7 +40,7 @@ def get_dataset(self, key, info):
         logger.debug('Reading in get_dataset %s.', key['name'])
         # For raw cal, don't apply scale and offset, return raw file counts
         if key['calibration'] == 'counts':
-            radiances = self.nc['Rad']
+            radiances = self.nc['Rad'].copy()
         else:
             radiances = self['Rad']
 
diff --git a/satpy/tests/reader_tests/test_abi_l1b.py b/satpy/tests/reader_tests/test_abi_l1b.py
index b12ad0c80e..b868c91d87 100644
--- a/satpy/tests/reader_tests/test_abi_l1b.py
+++ b/satpy/tests/reader_tests/test_abi_l1b.py
@@ -318,7 +318,6 @@ class Test_NC_ABI_L1B_invalid_cal(Test_NC_ABI_L1B_Base):
 
     def test_invalid_calibration(self):
         """Test detection of invalid calibration values."""
-
         # Need to use a custom DataID class because the real DataID class is
         # smart enough to detect the invalid calibration before the ABI L1B
         # get_dataset method gets a chance to run.