diff --git a/gfx/ycbcr/scale_yuv_argb.cpp b/gfx/ycbcr/scale_yuv_argb.cpp
index dd2f4ee3a5..7c35954bed 100644
--- a/gfx/ycbcr/scale_yuv_argb.cpp
+++ b/gfx/ycbcr/scale_yuv_argb.cpp
@@ -14,6 +14,7 @@
 #include "libyuv/convert_argb.h"
 #include "libyuv/scale.h"
 
+#include <algorithm>
 #include <assert.h>
 #include <string.h>
 
@@ -959,7 +960,7 @@ static void YUVToARGBCopy(const uint8_t* src_y, int src_stride_y,
                           mozilla::ColorRange color_range)
 {
   YUVBuferIter iter;
-  iter.src_width = src_width;
+  iter.src_width = std::min(src_width, dst_width);
   iter.src_height = src_height;
   iter.src_stride_y = src_stride_y;
   iter.src_stride_u = src_stride_u;