diff --git a/ldpc_decoder.hh b/ldpc_decoder.hh
index 010ae96..c5c52a9 100644
--- a/ldpc_decoder.hh
+++ b/ldpc_decoder.hh
@@ -117,7 +117,7 @@ class LDPCDecoder
 			int cnt = cnc[i];
 			int deg = cnt + 2;
 			for (int j = 0; j < W; ++j) {
-				TYPE mags[deg], inps[deg];
+				TYPE mags[CNC+2], inps[CNC+2];
 				TYPE min0 = vdup<TYPE>(127);
 				TYPE min1 = vdup<TYPE>(127);
 				TYPE signs = vdup<TYPE>(127);
@@ -236,7 +236,7 @@ public:
 		Loc *lo = loc;
 		for (int i = 0; i < q; ++i) {
 			int cnt = cnc[i];
-			int offset[cnt], shift[cnt];
+			int offset[CNC], shift[CNC];
 			for (int c = 0; c < cnt; ++c) {
 				shift[c] = pos[CNC*i+c] % M;
 				offset[c] = pos[CNC*i+c] - shift[c];
diff --git a/ldpc_encoder.hh b/ldpc_encoder.hh
index 32dea6e..c5b5d6d 100644
--- a/ldpc_encoder.hh
+++ b/ldpc_encoder.hh
@@ -41,7 +41,7 @@ public:
 		}
 		for (int i = 0; i < q; ++i) {
 			int cnt = cnc[i];
-			int offset[cnt], shift[cnt];
+			int offset[CNC], shift[CNC];
 			for (int c = 0; c < cnt; ++c) {
 				shift[c] = pos[CNC*i+c] % M;
 				offset[c] = pos[CNC*i+c] - shift[c];
diff --git a/pac_list_decoder.hh b/pac_list_decoder.hh
index 9aef402..ec4eae8 100644
--- a/pac_list_decoder.hh
+++ b/pac_list_decoder.hh
@@ -32,7 +32,7 @@ struct PACListLeaf
 	{
 		TYPE sft = soft[1];
 		for (int k = 0; k < TYPE::SIZE; ++k)
-			if (conv(state+k, 0) != sft.v[k] < 0)
+			if (conv(state+k, 0) != (sft.v[k] < 0))
 				metric[k] += std::abs(sft.v[k]);
 		TYPE hrd;
 		for (int k = 0; k < TYPE::SIZE; ++k)
@@ -53,7 +53,7 @@ struct PACListLeaf
 		for (int k = 0; k < TYPE::SIZE; ++k)
 			sfork[2*k] = sfork[2*k+1] = state[k];
 		for (int k = 0; k < 2*TYPE::SIZE; ++k)
-			if (conv(sfork+k, k&1) != sft.v[k>>1] < 0)
+			if (conv(sfork+k, k&1) != (sft.v[k>>1] < 0))
 				mfork[k] += std::abs(sft.v[k>>1]);
 		int perm[2*TYPE::SIZE];
 		CODE::insertion_sort(perm, mfork, 2*TYPE::SIZE);
diff --git a/reed_solomon_error_correction.hh b/reed_solomon_error_correction.hh
index 4796adf..edc8008 100644
--- a/reed_solomon_error_correction.hh
+++ b/reed_solomon_error_correction.hh
@@ -16,7 +16,7 @@ struct Chien
 	typedef typename GF::IndexType IndexType;
 	static int search(const ValueType *locator, int locator_degree, IndexType *locations)
 	{
-		ValueType tmp[locator_degree+1];
+		ValueType tmp[NR+1];
 		for (int i = 0; i <= locator_degree; ++i)
 			tmp[i] = locator[i];
 		int count = 0;
diff --git a/tests/bch_regression_test.cc b/tests/bch_regression_test.cc
index 706c8ea..958a507 100644
--- a/tests/bch_regression_test.cc
+++ b/tests/bch_regression_test.cc
@@ -25,10 +25,10 @@ void bch_test(ENC *encode, DEC *decode, int trials)
 		int data_len = rnd_len();
 		auto rnd_pos = std::bind(distribution(0, data_len + ENC::NP - 1), generator);
 		int D = (data_len + 7) / 8;
-		uint8_t data[D], orig_data[D];
+		uint8_t data[ENC::K], orig_data[ENC::K];
 		for (int i = 0; i < D; ++i)
 			data[i] = orig_data[i] = rnd_val();
-		int P = (ENC::NP + 7) / 8;
+		const int P = (ENC::NP + 7) / 8;
 		uint8_t parity[P];
 		(*encode)(data, parity, data_len);
 		for (int i = 0; i < D; ++i)
@@ -53,7 +53,7 @@ void bch_test(ENC *encode, DEC *decode, int trials)
 				CODE::xor_be_bit(parity, pos-data_len, 1);
 		}
 		int erasures_count = DEC::NR - 2 * error_count;
-		typename DEC::value_type erasures[erasures_count];
+		typename DEC::value_type erasures[DEC::NR];
 		for (int i = 0; i < erasures_count; ++i) {
 			int pos = rnd_pos();
 			for (int j = 0; j < error_count + i; ++j) {
@@ -90,7 +90,7 @@ void bch_reference_test(ENC *encode, DEC *decode, int trials)
 	while (--trials) {
 		int data_len = rnd_len();
 		auto rnd_pos = std::bind(distribution(0, data_len + ENC::NP - 1), generator);
-		typename ENC::value_type data[data_len], orig_data[data_len];
+		typename ENC::value_type data[ENC::K], orig_data[ENC::K];
 		for (int i = 0; i < data_len; ++i)
 			data[i] = orig_data[i] = rnd_val();
 		typename ENC::value_type parity[ENC::NP];
@@ -117,7 +117,7 @@ void bch_reference_test(ENC *encode, DEC *decode, int trials)
 				parity[pos-data_len] ^= 1;
 		}
 		int erasures_count = ENC::NR - 2 * error_count;
-		typename ENC::value_type erasures[erasures_count];
+		typename ENC::value_type erasures[ENC::NR];
 		for (int i = 0; i < erasures_count; ++i) {
 			int pos = rnd_pos();
 			for (int j = 0; j < error_count + i; ++j) {
diff --git a/tests/rs_regression_test.cc b/tests/rs_regression_test.cc
index be91edb..db8f3cc 100644
--- a/tests/rs_regression_test.cc
+++ b/tests/rs_regression_test.cc
@@ -24,7 +24,7 @@ void rs_test(ENC *encode, DEC *decode, int trials)
 	while (--trials) {
 		int data_len = rnd_len();
 		auto rnd_pos = std::bind(distribution(0, data_len + ENC::NP - 1), generator);
-		typename ENC::value_type data[data_len], orig_data[data_len];
+		typename ENC::value_type data[ENC::K], orig_data[ENC::K];
 		for (int i = 0; i < data_len; ++i)
 			data[i] = orig_data[i] = rnd_val();
 		typename ENC::value_type parity[ENC::NP];
@@ -51,7 +51,7 @@ void rs_test(ENC *encode, DEC *decode, int trials)
 				parity[pos-data_len] = rnd_val();
 		}
 		int erasures_count = ENC::NR - 2 * error_count;
-		typename ENC::value_type erasures[erasures_count];
+		typename ENC::value_type erasures[ENC::NR];
 		for (int i = 0; i < erasures_count; ++i) {
 			int pos = rnd_pos();
 			for (int j = 0; j < error_count + i; ++j) {
diff --git a/tests/xorshift_test.cc b/tests/xorshift_test.cc
index f929678..528bc71 100644
--- a/tests/xorshift_test.cc
+++ b/tests/xorshift_test.cc
@@ -4,6 +4,7 @@ Test for xorshift
 Copyright 2025 Ahmet Inan <inan@aicodix.de>
 */
 
+#include <cstdint>
 #include <cassert>
 #include <iostream>
 #include "xorshift.hh"