diff --git a/src/_imagingft.c b/src/_imagingft.c
index 62db561ea..183cfb23e 100644
--- a/src/_imagingft.c
+++ b/src/_imagingft.c
@@ -1084,7 +1084,7 @@ font_render(FontObject* self, PyObject* args)
                 if (color) {
                     /* target[RGB] returns the color, target[A] returns the mask */
                     /* target bands get split again in ImageDraw.text */
-                    target = im->image[yy] + xx * 4;
+                    target = (unsigned char*)im->image[yy] + xx * 4;
                 } else {
                     target = im->image8[yy] + xx;
                 }
diff --git a/src/libImaging/GetBBox.c b/src/libImaging/GetBBox.c
index 9a8ae1f32..8db78c2e2 100644
--- a/src/libImaging/GetBBox.c
+++ b/src/libImaging/GetBBox.c
@@ -198,7 +198,7 @@ ImagingGetExtrema(Imaging im, void *extrema)
           imin = imax = v;
           for (y = 0; y < im->ysize; y++) {
               for (x = 0; x < im->xsize; x++) {
-                  pixel = im->image[y] + x * sizeof(v);
+                  pixel = (UINT8*)im->image[y] + x * sizeof(v);
 #ifdef WORDS_BIGENDIAN
                   v = pixel[0] + (pixel[1] << 8);
 #else