diff --git a/src/hagl_bitmap.c b/src/hagl_bitmap.c
index 20c9224..0c82ac7 100644
--- a/src/hagl_bitmap.c
+++ b/src/hagl_bitmap.c
@@ -62,7 +62,7 @@ hline(void *_bitmap, int16_t x0, int16_t y0, uint16_t width, hagl_color_t color)
 {
     hagl_bitmap_t *bitmap = _bitmap;
 
-    hagl_color_t *ptr = (hagl_color_t *) (bitmap->buffer + bitmap->pitch * y0 + (bitmap->depth * x0 / 8));
+    hagl_color_t *ptr = (hagl_color_t *) (bitmap->buffer + bitmap->pitch * y0 + (bitmap->depth / 8) * x0);
     for (uint16_t x = 0; x < width; x++) {
         *ptr++ = color;
     }
@@ -73,7 +73,7 @@ vline(void *_bitmap, int16_t x0, int16_t y0, uint16_t height, hagl_color_t color
 {
     hagl_bitmap_t *bitmap = _bitmap;
 
-    hagl_color_t *ptr = (hagl_color_t *) (bitmap->buffer + bitmap->pitch * y0 + (bitmap->depth * x0 / 8));
+    hagl_color_t *ptr = (hagl_color_t *) (bitmap->buffer + bitmap->pitch * y0 + (bitmap->depth / 8) * x0);
     for (uint16_t y = 0; y < height; y++) {
         *ptr = color;
         ptr += bitmap->pitch / bitmap->depth / 8;