diff --git a/libavfilter/blend.h b/libavfilter/blend.h
index b046e062bc..52c1b777c2 100644
--- a/libavfilter/blend.h
+++ b/libavfilter/blend.h
@@ -69,6 +69,11 @@ enum BlendMode {
     BLEND_NB
 };
 
+typedef struct SliceParams {
+    double *values;
+    int starty;
+} SliceParams;
+
 typedef struct FilterParams {
     enum BlendMode mode;
     double opacity;
@@ -78,7 +83,7 @@ typedef struct FilterParams {
                   const uint8_t *bottom, ptrdiff_t bottom_linesize,
                   uint8_t *dst, ptrdiff_t dst_linesize,
                   ptrdiff_t width, ptrdiff_t height,
-                  struct FilterParams *param, double *values, int starty);
+                  struct FilterParams *param, SliceParams *sliceparam);
 } FilterParams;
 
 void ff_blend_init_x86(FilterParams *param, int depth);
diff --git a/libavfilter/blend_modes.c b/libavfilter/blend_modes.c
index 65c5e6f890..def5ae8e0d 100644
--- a/libavfilter/blend_modes.c
+++ b/libavfilter/blend_modes.c
@@ -91,7 +91,7 @@ static void fn0(NAME)(const uint8_t *_top, ptrdiff_t top_linesize, \
      const uint8_t *_bottom, ptrdiff_t bottom_linesize,       \
      uint8_t *_dst, ptrdiff_t dst_linesize,                   \
      ptrdiff_t width, ptrdiff_t height,                       \
-     FilterParams *param, double *values, int starty)         \
+     FilterParams *param, SliceParams *sliceparam)            \
 {                                                                                   \
     const PIXEL *top = (const PIXEL *)_top;                                         \
     const PIXEL *bottom = (const PIXEL *)_bottom;                                   \
diff --git a/libavfilter/vf_blend.c b/libavfilter/vf_blend.c
index 6b52647966..9ee8901e45 100644
--- a/libavfilter/vf_blend.c
+++ b/libavfilter/vf_blend.c
@@ -132,10 +132,12 @@ static void blend_expr_## name(const uint8_t *_top, ptrdiff_t top_linesize,
                                const uint8_t *_bottom, ptrdiff_t bottom_linesize,    \
                                uint8_t *_dst, ptrdiff_t dst_linesize,                \
                                ptrdiff_t width, ptrdiff_t height,              \
-                               FilterParams *param, double *values, int starty) \
+                               FilterParams *param, SliceParams *sliceparam)   \
 {                                                                              \
     const type *top = (const type*)_top;                                       \
     const type *bottom = (const type*)_bottom;                                 \
+    double *values = sliceparam->values;                                       \
+    int starty = sliceparam->starty;                                           \
     type *dst = (type*)_dst;                                                   \
     AVExpr *e = param->e;                                                      \
     int y, x;                                                                  \
@@ -171,6 +173,7 @@ static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
     const uint8_t *bottom = td->bottom->data[td->plane];
     uint8_t *dst    = td->dst->data[td->plane];
     double values[VAR_VARS_NB];
+    SliceParams sliceparam = {.values = &values[0], .starty = slice_start};
 
     values[VAR_N]  = td->inlink->frame_count_out;
     values[VAR_T]  = td->dst->pts == AV_NOPTS_VALUE ? NAN : td->dst->pts * av_q2d(td->inlink->time_base);
@@ -185,7 +188,7 @@ static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
                      td->bottom->linesize[td->plane],
                      dst + slice_start * td->dst->linesize[td->plane],
                      td->dst->linesize[td->plane],
-                     td->w, height, td->param, &values[0], slice_start);
+                     td->w, height, td->param, &sliceparam);
     return 0;
 }
 
diff --git a/libavfilter/vf_blend_init.h b/libavfilter/vf_blend_init.h
index d24f178032..956e1cb9fc 100644
--- a/libavfilter/vf_blend_init.h
+++ b/libavfilter/vf_blend_init.h
@@ -58,7 +58,7 @@ static void blend_copy ## src##_##depth(const uint8_t *top, ptrdiff_t top_linesi
                             const uint8_t *bottom, ptrdiff_t bottom_linesize,\
                             uint8_t *dst, ptrdiff_t dst_linesize,            \
                             ptrdiff_t width, ptrdiff_t height,               \
-                            FilterParams *param, double *values, int starty) \
+                            FilterParams *param, SliceParams *sliceparam)    \
 {                                                                            \
     av_image_copy_plane(dst, dst_linesize, src, src ## _linesize,            \
                         width * depth / 8, height);                          \
@@ -80,7 +80,7 @@ static void blend_normal_##name(const uint8_t *_top, ptrdiff_t top_linesize,
                                 const uint8_t *_bottom, ptrdiff_t bottom_linesize,\
                                 uint8_t *_dst, ptrdiff_t dst_linesize,            \
                                 ptrdiff_t width, ptrdiff_t height,                \
-                                FilterParams *param, double *values, int starty)  \
+                                FilterParams *param, SliceParams *sliceparam)     \
 {                                                                                 \
     const type *top = (const type*)_top;                                          \
     const type *bottom = (const type*)_bottom;                                    \
diff --git a/libavfilter/x86/vf_blend_init.c b/libavfilter/x86/vf_blend_init.c
index c326c43362..f4e097ee3d 100644
--- a/libavfilter/x86/vf_blend_init.c
+++ b/libavfilter/x86/vf_blend_init.c
@@ -28,7 +28,7 @@ void ff_blend_##name##_##opt(const uint8_t *top, ptrdiff_t top_linesize,       \
                              const uint8_t *bottom, ptrdiff_t bottom_linesize, \
                              uint8_t *dst, ptrdiff_t dst_linesize,             \
                              ptrdiff_t width, ptrdiff_t height,                \
-                             struct FilterParams *param, double *values, int starty);
+                             FilterParams *param, SliceParams *sliceparam);
 
 BLEND_FUNC(addition, sse2)
 BLEND_FUNC(addition, avx2)