diff --git a/common.hh b/common.hh
index 18b0dd2..df7f099 100644
--- a/common.hh
+++ b/common.hh
@@ -19,6 +19,7 @@ struct Common
 	static const int mls0_poly = 0x331;
 	static const int mls0_seed = 214;
 	static const int mls1_poly = 0x43;
+	static const int mls2_poly = 0x163;
 	static const int data_tones = 256;
 	static const int pilot_tones = 64;
 	static const int tone_count = data_tones + pilot_tones;
diff --git a/decode.cc b/decode.cc
index 1636f6e..bcbbc10 100644
--- a/decode.cc
+++ b/decode.cc
@@ -298,10 +298,10 @@ struct Decoder : Common
 					for (int i = pilot_off; i < tone_count; i += block_length)
 						chan[i] = DSP::lerp(chan[i], tone[i], value(0.5));
 				}
-				CODE::MLS seq(0x163, meta_data);
+				CODE::MLS seq2(mls2_poly, meta_data);
 				for (int i = 0; i < tone_count; ++i)
 					if (i % block_length != pilot_off)
-						demod[i] *= nrz(seq());
+						demod[i] *= nrz(seq2());
 				value sp = 0, np = 0;
 				for (int i = 0, l = k; i < tone_count; ++i) {
 					cmplx hard(1, 0);
diff --git a/encode.cc b/encode.cc
index 5b3f3dd..3098d95 100644
--- a/encode.cc
+++ b/encode.cc
@@ -86,12 +86,12 @@ struct Encoder : public Common
 			if (symbol_number >= 0) {
 				int meta_data = symbol_number ? trial : (oper_mode | (trial << 5));
 				hadamard_encoder(meta, meta_data);
-				CODE::MLS seq(0x163, meta_data);
+				CODE::MLS seq2(mls2_poly, meta_data);
 				for (int i = 0, m = 0; i < tone_count; ++i)
 					if (i % block_length == pilot_off)
 						temp[i] *= meta[m++];
 					else
-						temp[i] *= nrz(seq());
+						temp[i] *= nrz(seq2());
 			}
 			for (int i = 0; i < symbol_len; ++i)
 				fdom[i] = 0;
@@ -143,7 +143,7 @@ struct Encoder : public Common
 	}
 	void leading_noise(int num = 1)
 	{
-		CODE::MLS noise(0x163);
+		CODE::MLS noise(mls2_poly);
 		for (int j = 0; j < num; ++j) {
 			for (int i = 0; i < tone_count; ++i)
 				tone[i] = nrz(noise());