diff --git a/decoder.go b/decoder.go
index 99aced3..9197f8b 100644
--- a/decoder.go
+++ b/decoder.go
@@ -235,7 +235,7 @@ func nullBoolToString(v spanner.NullBool) string {
 
 func nullBytesToString(v []byte) string {
 	if v != nil {
-		return base64.RawStdEncoding.EncodeToString(v)
+		return base64.StdEncoding.EncodeToString(v)
 	} else {
 		return "NULL"
 	}
diff --git a/decoder_test.go b/decoder_test.go
index 229e419..090137a 100644
--- a/decoder_test.go
+++ b/decoder_test.go
@@ -86,8 +86,8 @@ func TestDecodeColumn(t *testing.T) {
 		},
 		{
 			desc:  "bytes",
-			value: []byte{'a', 'b', 'c'},
-			want:  "YWJj", // base64 encoded 'abc'
+			value: []byte{'a', 'b', 'c', 'd'},
+			want:  "YWJjZA==", // base64 encoded 'abc'
 		},
 		{
 			desc:  "float64",
@@ -190,8 +190,8 @@ func TestDecodeColumn(t *testing.T) {
 		},
 		{
 			desc:  "array bytes",
-			value: [][]byte{{'a', 'b', 'c'}, {'e', 'f', 'g'}},
-			want:  "[YWJj, ZWZn]",
+			value: [][]byte{{'a', 'b', 'c', 'd'}, {'e', 'f', 'g', 'h'}},
+			want:  "[YWJjZA==, ZWZnaA==]",
 		},
 		{
 			desc:  "array float64",