diff --git a/codec/decoder/core/src/decode_slice.cpp b/codec/decoder/core/src/decode_slice.cpp
index 8072793a..f067532d 100644
--- a/codec/decoder/core/src/decode_slice.cpp
+++ b/codec/decoder/core/src/decode_slice.cpp
@@ -1479,8 +1479,6 @@ int32_t WelsActualDecodeMbCavlcPSlice (PWelsDecoderContext pCtx) {
     uiCbpL = pCurLayer->pCbp[iMbXy] & 15;
   }
 
-  memset (pCurLayer->pScaledTCoeff[iMbXy], 0, MB_COEFF_LIST_SIZE * sizeof (int16_t));
-
   ST32A4 (&pNzc[0], 0);
   ST32A4 (&pNzc[4], 0);
   ST32A4 (&pNzc[8], 0);
@@ -1495,7 +1493,7 @@ int32_t WelsActualDecodeMbCavlcPSlice (PWelsDecoderContext pCtx) {
 
   if (pCurLayer->pCbp[iMbXy] || MB_TYPE_INTRA16x16 == pCurLayer->pMbType[iMbXy]) {
     int32_t iQpDelta, iId8x8, iId4x4;
-
+    memset (pCurLayer->pScaledTCoeff[iMbXy], 0, MB_COEFF_LIST_SIZE * sizeof (int16_t));
     WELS_READ_VERIFY (BsGetSe (pBs, &iCode)); //mb_qp_delta
     iQpDelta = iCode;