diff --git a/src/dec/vp8li.h b/src/dec/vp8li.h
index 2abf5d2e..7f96bf9d 100644
--- a/src/dec/vp8li.h
+++ b/src/dec/vp8li.h
@@ -48,8 +48,8 @@ typedef struct VP8LTransform VP8LTransform;
 struct VP8LTransform {
   VP8LImageTransformType type_;   // transform type.
   int                    bits_;   // subsampling bits defining transform window.
-  size_t                 xsize_;  // transform window X index.
-  size_t                 ysize_;  // transform window Y index.
+  int                    xsize_;  // transform window X index.
+  int                    ysize_;  // transform window Y index.
   uint32_t              *data_;   // transform data.
 };
 
diff --git a/src/dsp/lossless.c b/src/dsp/lossless.c
index 22aa0c0a..84160efd 100644
--- a/src/dsp/lossless.c
+++ b/src/dsp/lossless.c
@@ -323,7 +323,7 @@ static void ColorIndexInverseTransform(
 }
 
 void VP8LInverseTransform(const VP8LTransform* const transform,
-                          size_t row_start, size_t row_end,
+                          int row_start, int row_end,
                           uint32_t* const data_in, uint32_t* const data_out) {
   assert(row_start < row_end);
   assert(row_end <= transform->ysize_);
diff --git a/src/dsp/lossless.h b/src/dsp/lossless.h
index 89a03df9..10fdb96c 100644
--- a/src/dsp/lossless.h
+++ b/src/dsp/lossless.h
@@ -30,7 +30,7 @@ struct VP8LTransform;  // Defined in dec/vp8li.h.
 // The data_in & data_out are source and destination data pointers respectively
 // corresponding to the intermediate row (row_start).
 void VP8LInverseTransform(const struct VP8LTransform* const transform,
-                          size_t row_start, size_t row_end,
+                          int row_start, int row_end,
                           uint32_t* const data_in, uint32_t* const data_out);
 
 //------------------------------------------------------------------------------