diff --git a/bson/primitive/decimal.go b/bson/primitive/decimal.go
index 24ab58fc49..08c39514be 100644
--- a/bson/primitive/decimal.go
+++ b/bson/primitive/decimal.go
@@ -164,9 +164,6 @@ func (d Decimal128) BigInt() (*big.Int, int, error) {
 
 	// Would be handled by the logic below, but that's trivial and common.
 	if high == 0 && low == 0 && exp == 0 {
-		if posSign {
-			return new(big.Int), 0, nil
-		}
 		return new(big.Int), 0, nil
 	}