diff --git a/common/dct.cpp b/common/dct.cpp
index 9d551b95bac..374eee03fcb 100644
--- a/common/dct.cpp
+++ b/common/dct.cpp
@@ -30,7 +30,7 @@
 
 namespace Common {
 
-DCT::DCT(int bits, TransformType trans) : _bits(bits), _cos(_bits + 2), _trans(trans), _rdft(nullptr) {
+DCT::DCT(int bits, TransformType trans) : _bits(bits), _cos(1 << (_bits + 2) ), _trans(trans), _rdft(nullptr) {
 	int n = 1 << _bits;
 
 	_tCos = _cos.getTable();
diff --git a/common/rdft.cpp b/common/rdft.cpp
index b6af6cb4cde..f09f983731f 100644
--- a/common/rdft.cpp
+++ b/common/rdft.cpp
@@ -28,7 +28,7 @@
 
 namespace Common {
 
-RDFT::RDFT(int bits, TransformType trans) : _bits(bits), _sin(bits), _cos(bits), _fft(nullptr) {
+RDFT::RDFT(int bits, TransformType trans) : _bits(bits), _sin(1 << bits), _cos(1 << bits), _fft(nullptr) {
 	assert((_bits >= 4) && (_bits <= 16));
 
 	_inverse        = trans == IDFT_C2R || trans == DFT_C2R;