diff --git a/src/blt.c b/src/blt.c
index 9b62205..f69451c 100644
--- a/src/blt.c
+++ b/src/blt.c
@@ -433,11 +433,11 @@ void blt_colorfill(
 
             if (s >= 1024 * 200)
             {
-                __stosb(dst, color, dst_p * dst_h);
+                __stosb(dst, color, s);
             }
             else
             {
-                memset(dst, color, dst_p * dst_h);
+                memset(dst, color, s);
             }
         }
         else