diff --git a/src/io.c b/src/io.c
index d22fca8..6b3f58a 100644
--- a/src/io.c
+++ b/src/io.c
@@ -10,19 +10,15 @@ struct pang_io {
 };
 
 ssize_t pang_write(struct pang_io *io, off_t offset, const void *buf, size_t count) {
-    if (-1 == lseek(io->fd, offset, SEEK_SET))
-        return -1;
-    return write(io->fd, buf, count);
+    return pwrite(io->fd, buf, count, offset);
 }
 
 ssize_t pang_read(struct pang_io *io, off_t offset, void *buf, size_t count) {
-    if (-1 == lseek(io->fd, offset, SEEK_SET))
-        return -1;
-    return read(io->fd, buf, count);
+    return pread(io->fd, buf, count, offset);
 }
 
 struct pang_io *pang_open(const char *pathname) {
-    int fd = open(pathname, O_RDWR | O_TRUNC | O_CREAT, 0777);
+    int fd = open(pathname, O_RDWR | O_CREAT, 0777);
     if (-1 == fd)
         return NULL;
     struct pang_io *io = malloc(sizeof(struct pang_io));