diff --git a/pgtype/builtin_wrappers.go b/pgtype/builtin_wrappers.go
index d93f8d59..e34dd578 100644
--- a/pgtype/builtin_wrappers.go
+++ b/pgtype/builtin_wrappers.go
@@ -238,7 +238,7 @@ func (w *uint64Wrapper) ScanNumeric(v Numeric) error {
 		return fmt.Errorf("cannot scan %v into *uint64", bi.String())
 	}
 
-	*w = uint64Wrapper(v.Int.Uint64())
+	*w = uint64Wrapper(bi.Uint64())
 
 	return nil
 }
@@ -291,7 +291,7 @@ func (w *uintWrapper) ScanNumeric(v Numeric) error {
 		return fmt.Errorf("cannot scan %v into *uint", bi.String())
 	}
 
-	ui := v.Int.Uint64()
+	ui := bi.Uint64()
 
 	if math.MaxUint < ui {
 		return fmt.Errorf("cannot scan %v into *uint", ui)
diff --git a/pgtype/numeric_test.go b/pgtype/numeric_test.go
index 46faa5ce..4852f442 100644
--- a/pgtype/numeric_test.go
+++ b/pgtype/numeric_test.go
@@ -110,8 +110,10 @@ func TestNumericCodec(t *testing.T) {
 		{int64(math.MinInt64 + 1), new(pgtype.Numeric), isExpectedEqNumeric(mustParseNumeric(t, strconv.FormatInt(math.MinInt64+1, 10)))},
 		{int64(math.MaxInt64), new(pgtype.Numeric), isExpectedEqNumeric(mustParseNumeric(t, strconv.FormatInt(math.MaxInt64, 10)))},
 		{int64(math.MaxInt64 - 1), new(pgtype.Numeric), isExpectedEqNumeric(mustParseNumeric(t, strconv.FormatInt(math.MaxInt64-1, 10)))},
+		{uint64(100), new(uint64), isExpectedEq(uint64(100))},
 		{uint64(math.MaxUint64), new(uint64), isExpectedEq(uint64(math.MaxUint64))},
 		{uint(math.MaxUint), new(uint), isExpectedEq(uint(math.MaxUint))},
+		{uint(100), new(uint), isExpectedEq(uint(100))},
 		{"1.23", new(string), isExpectedEq("1.23")},
 		{pgtype.Numeric{}, new(pgtype.Numeric), isExpectedEq(pgtype.Numeric{})},
 		{nil, new(pgtype.Numeric), isExpectedEq(pgtype.Numeric{})},