diff --git a/codec/decoder/core/src/mc.cpp b/codec/decoder/core/src/mc.cpp
index bcc166be..3c634458 100644
--- a/codec/decoder/core/src/mc.cpp
+++ b/codec/decoder/core/src/mc.cpp
@@ -133,7 +133,7 @@ static inline void McCopyWidthEq16_c (const uint8_t* pSrc, int32_t iSrcStride, u
 
 //--------------------Luma sample MC------------------//
 
-static inline int32_t HorFilterInput16bit_c (int16_t* pSrc) {
+static inline int32_t HorFilterInput16bit_c (const int16_t* pSrc) {
   int32_t iPix05 = pSrc[-2] + pSrc[3];
   int32_t iPix14 = pSrc[-1] + pSrc[2];
   int32_t iPix23 = pSrc[ 0] + pSrc[1];
diff --git a/codec/encoder/core/src/mc.cpp b/codec/encoder/core/src/mc.cpp
index 55b5f945..60b32564 100644
--- a/codec/encoder/core/src/mc.cpp
+++ b/codec/encoder/core/src/mc.cpp
@@ -125,7 +125,7 @@ static inline int32_t HorFilter_c (const uint8_t* pSrc) {
   return (iPix05 - ((iPix14 << 2) + iPix14) + (iPix23 << 4) + (iPix23 << 2));
 }
 
-static inline int32_t HorFilterInput16bit1_c (int16_t* pSrc) {
+static inline int32_t HorFilterInput16bit1_c (const int16_t* pSrc) {
   int32_t iPix05 = pSrc[-2] + pSrc[3];
   int32_t iPix14 = pSrc[-1] + pSrc[2];
   int32_t iPix23 = pSrc[ 0] + pSrc[1];