diff --git a/src/Filesystem/file.c b/src/Filesystem/file.c
index 7dcdd74..1c56911 100644
--- a/src/Filesystem/file.c
+++ b/src/Filesystem/file.c
@@ -91,7 +91,7 @@ Maybe file_readAll(File* file, char** allBytes){
                 safethrow(ERR_IO,; StringBuilder_free(sb));
             break;
         }
-        buffer[i]=(char)rezult;
+        buffer[i%sizeof(buffer)]=(char)rezult;
         i++;
         if(!(i%sizeof(buffer)))
             StringBuilder_append_string(sb,bufStr);