diff --git a/sys/compat/cloudabi/cloudabi_file.c b/sys/compat/cloudabi/cloudabi_file.c
index 6133ddd6ae54..5811c0bbb314 100644
--- a/sys/compat/cloudabi/cloudabi_file.c
+++ b/sys/compat/cloudabi/cloudabi_file.c
@@ -563,6 +563,8 @@ cloudabi_sys_file_stat_fget(struct thread *td,
 	cloudabi_filetype_t filetype;
 	int error;
 
+	memset(&csb, 0, sizeof(csb));
+
 	/* Fetch file descriptor attributes. */
 	error = fget(td, uap->fd, cap_rights_init(&rights, CAP_FSTAT), &fp);
 	if (error != 0)
@@ -650,6 +652,8 @@ cloudabi_sys_file_stat_get(struct thread *td,
 	char *path;
 	int error;
 
+	memset(&csb, 0, sizeof(csb));
+
 	error = copyin_path(uap->path, uap->path_len, &path);
 	if (error != 0)
 		return (error);