diff --git a/src/common-tests/gsvector_yuvtorgb_test.cpp b/src/common-tests/gsvector_yuvtorgb_test.cpp
index 63c95de03..684c14806 100644
--- a/src/common-tests/gsvector_yuvtorgb_test.cpp
+++ b/src/common-tests/gsvector_yuvtorgb_test.cpp
@@ -73,9 +73,9 @@ static void YUVToRGB_Scalar(const std::array<s16, 64>& Crblk, const std::array<s
 
 TEST(GSVector, YUVToRGB)
 {
-  std::array<s16, 64> crblk;
-  std::array<s16, 64> cbblk;
-  std::array<s16, 64> yblk;
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> crblk;
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> cbblk;
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> yblk;
   for (s16 i = -128; i < 128; i++)
   {
     for (u32 j = 0; j < 64; j++)
@@ -91,10 +91,10 @@ TEST(GSVector, YUVToRGB)
         for (u32 j = 0; j < 64; j++)
           yblk[j] = l;
 
-        u32 rows[64];
+        alignas(VECTOR_ALIGNMENT) u32 rows[64];
         YUVToRGB_Scalar(crblk, cbblk, yblk, rows, false);
 
-        u32 rowv[64];
+        alignas(VECTOR_ALIGNMENT) u32 rowv[64];
         YUVToRGB_Vector(crblk, cbblk, yblk, rowv, false);
         ASSERT_EQ(std::memcmp(rows, rowv, sizeof(rows)), 0);
 
@@ -112,9 +112,9 @@ u32 g_gsvector_yuvtorgb_temp[64];
 
 TEST(GSVector, YUVToRGB_Scalar)
 {
-  std::array<s16, 64> crblk;
-  std::array<s16, 64> cbblk;
-  std::array<s16, 64> yblk;
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> crblk;
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> cbblk;
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> yblk;
   for (s16 i = -128; i < 128; i++)
   {
     for (u32 j = 0; j < 64; j++)
@@ -138,9 +138,9 @@ TEST(GSVector, YUVToRGB_Scalar)
 
 TEST(GSVector, YUVToRGB_Vector)
 {
-  std::array<s16, 64> crblk;
-  std::array<s16, 64> cbblk;
-  std::array<s16, 64> yblk;
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> crblk;
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> cbblk;
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> yblk;
   for (s16 i = -128; i < 128; i++)
   {
     for (u32 j = 0; j < 64; j++)
diff --git a/src/core/mdec.cpp b/src/core/mdec.cpp
index 54bada107..74c2284b7 100644
--- a/src/core/mdec.cpp
+++ b/src/core/mdec.cpp
@@ -142,7 +142,7 @@ struct MDECState
   std::array<u8, 64> iq_uv{};
   std::array<u8, 64> iq_y{};
 
-  std::array<s16, 64> scale_table{};
+  alignas(VECTOR_ALIGNMENT) std::array<s16, 64> scale_table{};
 
   // blocks, for colour: 0 - Crblk, 1 - Cbblk, 2-5 - Y 1-4
   alignas(VECTOR_ALIGNMENT) std::array<std::array<s16, 64>, NUM_BLOCKS> blocks;
@@ -950,7 +950,7 @@ bool MDEC::DecodeRLE_New(s16* blk, const u8* qt)
 static s16 IDCTRow(const s16* blk, const s16* idct_matrix)
 {
   // IDCT matrix is -32768..32767, block is -16384..16383. 4 adds can happen without overflow.
-  GSVector4i sum = GSVector4i::load<false>(blk).madd_s16(GSVector4i::load<false>(idct_matrix)).addp_s32();
+  GSVector4i sum = GSVector4i::load<false>(blk).madd_s16(GSVector4i::load<true>(idct_matrix)).addp_s32();
   return static_cast<s16>(((static_cast<s64>(sum.extract32<0>()) + static_cast<s64>(sum.extract32<1>())) + 0x20000) >>
                           18);
 }