diff --git a/src/dsp/rescaler.c b/src/dsp/rescaler.c
index 640b462c..9e5f1b44 100644
--- a/src/dsp/rescaler.c
+++ b/src/dsp/rescaler.c
@@ -28,16 +28,17 @@ static void RescalerImportRowC(WebPRescaler* const wrk,
   if (!wrk->x_expand) {
     int sum = 0;
     for (x_out = channel; x_out < x_out_max; x_out += x_stride) {
+      uint32_t base = 0;
       accum += wrk->x_add;
-      for (; accum > 0; accum -= wrk->x_sub) {
-        sum += src[x_in];
+      while (accum > 0) {
+        accum -= wrk->x_sub;
+        base = src[x_in];
+        sum += base;
         x_in += x_stride;
       }
       {        // Emit next horizontal pixel.
-        const int32_t base = src[x_in];
         const int32_t frac = base * (-accum);
-        x_in += x_stride;
-        wrk->frow[x_out] = (sum + base) * wrk->x_sub - frac;
+        wrk->frow[x_out] = sum * wrk->x_sub - frac;
         // fresh fractional start for next pixel
         sum = (int)MULT_FIX(frac, wrk->fx_scale);
       }
diff --git a/src/dsp/rescaler_mips32.c b/src/dsp/rescaler_mips32.c
index 467e6116..330de3c5 100644
--- a/src/dsp/rescaler_mips32.c
+++ b/src/dsp/rescaler_mips32.c
@@ -22,7 +22,7 @@ static void ImportRow(WebPRescaler* const wrk,
   const int x_stride = wrk->num_channels;
   const int x_out_max = wrk->dst_width * wrk->num_channels;
   const int fx_scale = wrk->fx_scale;
-  const int x_add = wrk->x_add;
+  const int x_add = wrk->x_add - wrk->x_sub;
   const int x_sub = wrk->x_sub;
   int* frow = wrk->frow + channel;
   int* irow = wrk->irow + channel;
diff --git a/src/dsp/rescaler_mips_dsp_r2.c b/src/dsp/rescaler_mips_dsp_r2.c
index 68dcb189..5f2a969b 100644
--- a/src/dsp/rescaler_mips_dsp_r2.c
+++ b/src/dsp/rescaler_mips_dsp_r2.c
@@ -22,7 +22,7 @@ static void ImportRow(WebPRescaler* const wrk,
   const int x_stride = wrk->num_channels;
   const int x_out_max = wrk->dst_width * wrk->num_channels;
   const int fx_scale = wrk->fx_scale;
-  const int x_add = wrk->x_add;
+  const int x_add = wrk->x_add - wrk->x_sub;
   const int x_sub = wrk->x_sub;
   int* frow = wrk->frow + channel;
   int* irow = wrk->irow + channel;
diff --git a/src/utils/rescaler.c b/src/utils/rescaler.c
index cd45ae8d..db1ea6c9 100644
--- a/src/utils/rescaler.c
+++ b/src/utils/rescaler.c
@@ -31,7 +31,7 @@ void WebPRescalerInit(WebPRescaler* const wrk, int src_width, int src_height,
   wrk->dst_stride = dst_stride;
   wrk->num_channels = num_channels;
   // for 'x_expand', we use bilinear interpolation
-  wrk->x_add = wrk->x_expand ? (x_sub - 1) : x_add - x_sub;
+  wrk->x_add = wrk->x_expand ? (x_sub - 1) : x_add;
   wrk->x_sub = wrk->x_expand ? (x_add - 1) : x_sub;
   wrk->y_accum = y_add;
   wrk->y_add = y_add;