diff --git a/codec/processing/src/backgrounddetection/BackgroundDetection.cpp b/codec/processing/src/backgrounddetection/BackgroundDetection.cpp
index f687de0c..93e58519 100644
--- a/codec/processing/src/backgrounddetection/BackgroundDetection.cpp
+++ b/codec/processing/src/backgrounddetection/BackgroundDetection.cpp
@@ -57,7 +57,7 @@ CBackgroundDetection::CBackgroundDetection (int32_t iCpuFlag) {
 }
 
 CBackgroundDetection::~CBackgroundDetection() {
-  FreeOUArrayMemory();
+  WelsFree (m_BgdParam.pOU_array);
 }
 
 EResult CBackgroundDetection::Process (int32_t iType, SPixMap* pSrcPixMap, SPixMap* pRefPixMap) {
@@ -80,7 +80,7 @@ EResult CBackgroundDetection::Process (int32_t iType, SPixMap* pSrcPixMap, SPixM
 
   int32_t iCurFrameSize = m_BgdParam.iBgdWidth * m_BgdParam.iBgdHeight;
   if (m_BgdParam.pOU_array == NULL || iCurFrameSize > m_iLargestFrameSize) {
-    FreeOUArrayMemory();
+    WelsFree (m_BgdParam.pOU_array);
     m_BgdParam.pOU_array = AllocateOUArrayMemory (m_BgdParam.iBgdWidth, m_BgdParam.iBgdHeight);
     m_iLargestFrameSize = iCurFrameSize;
   }
@@ -112,10 +112,6 @@ inline SBackgroundOU* CBackgroundDetection::AllocateOUArrayMemory (int32_t iWidt
   return (SBackgroundOU*)WelsMalloc (iMaxOUWidth * iMaxOUHeight * sizeof (SBackgroundOU));
 }
 
-inline void CBackgroundDetection::FreeOUArrayMemory() {
-  _SafeFree (m_BgdParam.pOU_array);
-}
-
 void CBackgroundDetection::GetOUParameters (SVAACalcResult* sVaaCalcInfo, int32_t iMbIndex, int32_t iMbWidth,
     SBackgroundOU* pBgdOU) {
   int32_t	iSubSD[4];
diff --git a/codec/processing/src/backgrounddetection/BackgroundDetection.h b/codec/processing/src/backgrounddetection/BackgroundDetection.h
index 886c9792..0c556cdc 100644
--- a/codec/processing/src/backgrounddetection/BackgroundDetection.h
+++ b/codec/processing/src/backgrounddetection/BackgroundDetection.h
@@ -81,7 +81,6 @@ class CBackgroundDetection : public IStrategy {
 
  private:
   inline SBackgroundOU* AllocateOUArrayMemory (int32_t iWidth, int32_t iHeight);
-  inline void     FreeOUArrayMemory();
   inline int32_t  CalculateAsdChromaEdge (uint8_t* pOriRef, uint8_t* pOriCur, int32_t iStride);
   inline bool   ForegroundDilation23Luma (SBackgroundOU* pBackgroundOU,
                                           SBackgroundOU* pOUNeighbours[]); //Foreground_Dilation_2_3_Luma