diff --git a/modules/imgproc/src/imgwarp.cpp b/modules/imgproc/src/imgwarp.cpp
index 0f91ff2fc5..c8371daf2d 100644
--- a/modules/imgproc/src/imgwarp.cpp
+++ b/modules/imgproc/src/imgwarp.cpp
@@ -955,7 +955,7 @@ static void remapBicubic( const Mat& _src, Mat& _dst, const Mat& _xy,
                     sum += S[0]*w[8] + S[cn]*w[9] + S[cn*2]*w[10] + S[cn*3]*w[11];
                     S += sstep;
                     sum += S[0]*w[12] + S[cn]*w[13] + S[cn*2]*w[14] + S[cn*3]*w[15];
-                    S += 1 - sstep*3;
+                    S -= sstep * 3 - 1;
                     D[k] = castOp(sum);
                 }
             }
@@ -988,9 +988,9 @@ static void remapBicubic( const Mat& _src, Mat& _dst, const Mat& _xy,
                     for(int i = 0; i < 4; i++, w += 4 )
                     {
                         int yi = y[i];
-                        const T* S = S0 + yi*sstep;
                         if( yi < 0 )
                             continue;
+                        const T* S = S0 + yi*sstep;
                         if( x[0] >= 0 )
                             sum += (S[x[0]] - cv)*w[0];
                         if( x[1] >= 0 )