diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index 96fcc257a2..d8bb0a0179 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -782,7 +782,8 @@ def to_internal_value(self, data):
self.fail('invalid')
sign, digittuple, exponent = value.as_tuple()
- decimals = abs(exponent)
+ decimals = exponent * decimal.Decimal(-1) if exponent < 0 else 0
+
# digittuple doesn't include any leading zeros.
digits = len(digittuple)
if decimals > digits:
diff --git a/tests/test_fields.py b/tests/test_fields.py
index 55e9aacc11..568e8d5e7a 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -647,6 +647,7 @@ class TestDecimalField(FieldValues):
0: Decimal('0'),
12.3: Decimal('12.3'),
0.1: Decimal('0.1'),
+ '2E+2': Decimal('200'),
}
invalid_inputs = (
('abc', ["A valid number is required."]),
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