diff --git a/usr.sbin/bhyve/qemu_fwcfg.c b/usr.sbin/bhyve/qemu_fwcfg.c
--- a/usr.sbin/bhyve/qemu_fwcfg.c
+++ b/usr.sbin/bhyve/qemu_fwcfg.c
@@ -594,14 +594,11 @@
 			return (ENOMEM);
 		}
 		fwcfg_file->size = read(fd, fwcfg_file->data, sb.st_size);
-		if ((ssize_t)fwcfg_file->size < 0) {
+		if (fwcfg_file->size != sb.st_size) {
 			warn("Unable to read file \"%s\"", opt_ptr);
 			free(fwcfg_file->data);
 			close(fd);
 			return (-1);
-		} else if (fwcfg_file->size < sb.st_size) {
-			warnx("Only read %u bytes of file \"%s\"",
-			    fwcfg_file->size, opt_ptr);
 		}
 
 		close(fd);