diff --git a/modules/core/src/convert.cpp b/modules/core/src/convert.cpp
index 7e561b6e75..fd07a7fc53 100644
--- a/modules/core/src/convert.cpp
+++ b/modules/core/src/convert.cpp
@@ -5841,7 +5841,6 @@ private:
 
 static bool ipp_lut(Mat &src, Mat &lut, Mat &dst)
 {
-    int cn = src.channels();
     int lutcn = lut.channels();
 
     if(src.dims > 2)
diff --git a/modules/core/src/copy.cpp b/modules/core/src/copy.cpp
index 27e8c00d5c..0d483ede1d 100644
--- a/modules/core/src/copy.cpp
+++ b/modules/core/src/copy.cpp
@@ -691,7 +691,6 @@ static bool ocl_flip(InputArray _src, OutputArray _dst, int flipCode )
 #if defined HAVE_IPP
 static bool ipp_flip( Mat &src, Mat &dst, int flip_mode )
 {
-    Size size = src.size();
     int type = src.type();
 
     typedef IppStatus (CV_STDCALL * ippiMirror)(const void * pSrc, int srcStep, void * pDst, int dstStep, IppiSize roiSize, IppiAxis flip);