diff --git a/source/row_common.cc b/source/row_common.cc
index f4e987621..83442496c 100644
--- a/source/row_common.cc
+++ b/source/row_common.cc
@@ -1654,8 +1654,8 @@ MAKEYUVCONSTANTS(V2020, YG, YB, UB, UG, VG, VR)
 
 #define CALC_RGB16                                \
   int32_t y1 = ((uint32_t)(y32 * yg) >> 16) + yb; \
-  int8_t ui = u;                                  \
-  int8_t vi = v;                                  \
+  int8_t ui = (int8_t)u;                          \
+  int8_t vi = (int8_t)v;                          \
   ui -= 0x80;                                     \
   vi -= 0x80;                                     \
   int b16 = y1 + (ui * ub);                       \
diff --git a/source/row_win.cc b/source/row_win.cc
index 7dccacc7f..c7c1ff60d 100644
--- a/source/row_win.cc
+++ b/source/row_win.cc
@@ -75,7 +75,7 @@ extern "C" {
 
 // Convert 8 pixels: 8 UV and 8 Y.
 #define YUVTORGB(yuvconstants)                                      \
-  xmm3 = _mm_sub_epi8(xmm3, _mm_set1_epi8(0x80));                   \
+  xmm3 = _mm_sub_epi8(xmm3, _mm_set1_epi8((char)0x80));             \
   xmm4 = _mm_mulhi_epu16(xmm4, *(__m128i*)yuvconstants->kYToRgb);   \
   xmm4 = _mm_add_epi16(xmm4, *(__m128i*)yuvconstants->kYBiasToRgb); \
   xmm0 = _mm_maddubs_epi16(*(__m128i*)yuvconstants->kUVToB, xmm3);  \