diff --git a/source/scale.cc b/source/scale.cc
index 7e762a1f..dd292f2f 100644
--- a/source/scale.cc
+++ b/source/scale.cc
@@ -51,7 +51,7 @@ static void ScalePlaneDown2(int src_width,
           ? ScaleRowDown2_C
           : (filtering == kFilterLinear ? ScaleRowDown2Linear_C
                                         : ScaleRowDown2Box_C);
-  int row_stride = src_stride * 2;
+  ptrdiff_t row_stride = (ptrdiff_t)src_stride * 2;
   (void)src_width;
   (void)src_height;
   if (!filtering) {
@@ -163,7 +163,7 @@ static void ScalePlaneDown2_16(int src_width,
           ? ScaleRowDown2_16_C
           : (filtering == kFilterLinear ? ScaleRowDown2Linear_16_C
                                         : ScaleRowDown2Box_16_C);
-  int row_stride = src_stride * 2;
+  ptrdiff_t row_stride = (ptrdiff_t)src_stride * 2;
   (void)src_width;
   (void)src_height;
   if (!filtering) {
@@ -228,7 +228,7 @@ void ScalePlaneDown2_16To8(int src_width,
                  ? ScaleRowDown2_16To8_C
                  : (filtering == kFilterLinear ? ScaleRowDown2Linear_16To8_C
                                                : ScaleRowDown2Box_16To8_C));
-  int row_stride = src_stride * 2;
+  ptrdiff_t row_stride = (ptrdiff_t)src_stride * 2;
   (void)dst_height;
   if (!filtering) {
     src_ptr += src_stride;  // Point to odd rows.
@@ -268,7 +268,7 @@ static void ScalePlaneDown4(int src_width,
   void (*ScaleRowDown4)(const uint8_t* src_ptr, ptrdiff_t src_stride,
                         uint8_t* dst_ptr, int dst_width) =
       filtering ? ScaleRowDown4Box_C : ScaleRowDown4_C;
-  int row_stride = src_stride * 4;
+  ptrdiff_t row_stride = (ptrdiff_t)src_stride * 4;
   (void)src_width;
   (void)src_height;
   if (!filtering) {
@@ -340,7 +340,7 @@ static void ScalePlaneDown4_16(int src_width,
   void (*ScaleRowDown4)(const uint16_t* src_ptr, ptrdiff_t src_stride,
                         uint16_t* dst_ptr, int dst_width) =
       filtering ? ScaleRowDown4Box_16_C : ScaleRowDown4_16_C;
-  int row_stride = src_stride * 4;
+  ptrdiff_t row_stride = (ptrdiff_t)src_stride * 4;
   (void)src_width;
   (void)src_height;
   if (!filtering) {
diff --git a/source/scale_argb.cc b/source/scale_argb.cc
index eb6caa53..08515275 100644
--- a/source/scale_argb.cc
+++ b/source/scale_argb.cc
@@ -48,7 +48,7 @@ static void ScaleARGBDown2(int src_width,
                            int dy,
                            enum FilterMode filtering) {
   int j;
-  int row_stride = src_stride * (dy >> 16);
+  ptrdiff_t row_stride = (ptrdiff_t)((dy >> 16) * (intptr_t)src_stride);
   void (*ScaleARGBRowDown2)(const uint8_t* src_argb, ptrdiff_t src_stride,
                             uint8_t* dst_argb, int dst_width) =
       filtering == kFilterNone
@@ -169,7 +169,7 @@ static int ScaleARGBDown4Box(int src_width,
   align_buffer_64(row, row_size * 2);
   if (!row)
     return 1;
-  int row_stride = src_stride * (dy >> 16);
+  ptrdiff_t row_stride = (ptrdiff_t)((dy >> 16) * (intptr_t)src_stride);
   void (*ScaleARGBRowDown2)(const uint8_t* src_argb, ptrdiff_t src_stride,
                             uint8_t* dst_argb, int dst_width) =
       ScaleARGBRowDown2Box_C;
@@ -209,7 +209,7 @@ static int ScaleARGBDown4Box(int src_width,
 
   for (j = 0; j < dst_height; ++j) {
     ScaleARGBRowDown2(src_argb, src_stride, row, dst_width * 2);
-    ScaleARGBRowDown2(src_argb + src_stride * 2, src_stride, row + row_size,
+    ScaleARGBRowDown2(src_argb + (ptrdiff_t)src_stride * 2, src_stride, row + row_size,
                       dst_width * 2);
     ScaleARGBRowDown2(row, row_size, dst_argb, dst_width);
     src_argb += row_stride;
diff --git a/source/scale_uv.cc b/source/scale_uv.cc
index 35ad55dd..f6d2fff8 100644
--- a/source/scale_uv.cc
+++ b/source/scale_uv.cc
@@ -69,7 +69,7 @@ static void ScaleUVDown2(int src_width,
                          int dy,
                          enum FilterMode filtering) {
   int j;
-  int row_stride = src_stride * (dy >> 16);
+  ptrdiff_t row_stride = (ptrdiff_t)((dy >> 16) * (intptr_t)src_stride);
   void (*ScaleUVRowDown2)(const uint8_t* src_uv, ptrdiff_t src_stride,
                           uint8_t* dst_uv, int dst_width) =
       filtering == kFilterNone
@@ -188,7 +188,7 @@ static int ScaleUVDown4Box(int src_width,
   align_buffer_64(row, row_size * 2);
   if (!row)
     return 1;
-  int row_stride = src_stride * (dy >> 16);
+  ptrdiff_t row_stride = (ptrdiff_t)((dy >> 16) * (intptr_t)src_stride);
   void (*ScaleUVRowDown2)(const uint8_t* src_uv, ptrdiff_t src_stride,
                           uint8_t* dst_uv, int dst_width) =
       ScaleUVRowDown2Box_C;
@@ -237,7 +237,7 @@ static int ScaleUVDown4Box(int src_width,
 
   for (j = 0; j < dst_height; ++j) {
     ScaleUVRowDown2(src_uv, src_stride, row, dst_width * 2);
-    ScaleUVRowDown2(src_uv + src_stride * 2, src_stride, row + row_size,
+    ScaleUVRowDown2(src_uv + (ptrdiff_t)src_stride * 2, src_stride, row + row_size,
                     dst_width * 2);
     ScaleUVRowDown2(row, row_size, dst_uv, dst_width);
     src_uv += row_stride;