diff --git a/libavfilter/blend_modes.c b/libavfilter/blend_modes.c
index 9b1e78b146..35e365996c 100644
--- a/libavfilter/blend_modes.c
+++ b/libavfilter/blend_modes.c
@@ -92,22 +92,18 @@ static void fn0(NAME)(const uint8_t *_top, ptrdiff_t top_linesize, \
      ptrdiff_t width, ptrdiff_t height,                       \
      FilterParams *param, SliceParams *sliceparam)            \
 {                                                                                   \
-    const PIXEL *top = (const PIXEL *)_top;                                         \
-    const PIXEL *bottom = (const PIXEL *)_bottom;                                   \
-    PIXEL *dst = (PIXEL *)_dst;                                                     \
     const float opacity = param->opacity;                                           \
                                                                                     \
-    dst_linesize /= sizeof(PIXEL);                                                  \
-    top_linesize /= sizeof(PIXEL);                                                  \
-    bottom_linesize /= sizeof(PIXEL);                                               \
-                                                                                    \
     for (int i = 0; i < height; i++) {                                              \
+        const PIXEL *top = (const PIXEL *)_top;                                     \
+        const PIXEL *bottom = (const PIXEL *)_bottom;                               \
+        PIXEL *dst = (PIXEL *)_dst;                                                 \
         for (int j = 0; j < width; j++) {                                           \
             dst[j] = top[j] + ((EXPR)-top[j]) * opacity;                            \
         }                                                                           \
-        dst += dst_linesize;                                                        \
-        top += top_linesize;                                                        \
-        bottom += bottom_linesize;                                                  \
+        _dst    += dst_linesize;                                                    \
+        _top    += top_linesize;                                                    \
+        _bottom += bottom_linesize;                                                 \
     }                                                                               \
 }
 
diff --git a/libavfilter/vf_blend_init.h b/libavfilter/vf_blend_init.h
index 98d440fe67..7f66796e3e 100644
--- a/libavfilter/vf_blend_init.h
+++ b/libavfilter/vf_blend_init.h
@@ -82,22 +82,18 @@ static void blend_normal_##name(const uint8_t *_top, ptrdiff_t top_linesize,
                                 ptrdiff_t width, ptrdiff_t height,                \
                                 FilterParams *param, SliceParams *sliceparam)     \
 {                                                                                 \
-    const type *top = (const type*)_top;                                          \
-    const type *bottom = (const type*)_bottom;                                    \
-    type *dst = (type*)_dst;                                                      \
     const float opacity = param->opacity;                                         \
                                                                                   \
-    dst_linesize /= sizeof(type);                                                 \
-    top_linesize /= sizeof(type);                                                 \
-    bottom_linesize /= sizeof(type);                                              \
-                                                                                  \
     for (int i = 0; i < height; i++) {                                            \
+        const type *top = (const type*)_top;                                      \
+        const type *bottom = (const type*)_bottom;                                \
+        type *dst = (type*)_dst;                                                  \
         for (int j = 0; j < width; j++) {                                         \
             dst[j] = top[j] * opacity + bottom[j] * (1.f - opacity);              \
         }                                                                         \
-        dst    += dst_linesize;                                                   \
-        top    += top_linesize;                                                   \
-        bottom += bottom_linesize;                                                \
+        _dst    += dst_linesize;                                                  \
+        _top    += top_linesize;                                                  \
+        _bottom += bottom_linesize;                                               \
     }                                                                             \
 }