diff --git a/postgres/numeric/numeric.go b/postgres/numeric/numeric.go
index 753feff..73fdb16 100644
--- a/postgres/numeric/numeric.go
+++ b/postgres/numeric/numeric.go
@@ -129,7 +129,7 @@ func (n Numeric) String() string {
 
 	exp = -exp
 	for length <= exp {
-		bytes = append(bytes, byte('0'))
+		bytes = append([]byte{byte('0')}, bytes...)
 		length++
 	}
 
@@ -166,7 +166,7 @@ func (n Numeric) MarshalJSON() ([]byte, error) {
 
 	exp = -exp
 	for length <= exp {
-		bytes = append(bytes, byte('0'))
+		bytes = append([]byte{byte('0')}, bytes...)
 		length++
 	}