diff --git a/sys/contrib/zstd/lib/freebsd/assert.h b/sys/contrib/zstd/lib/freebsd/assert.h
new file mode 100644
index 000000000000..eb2efe9be6c0
--- /dev/null
+++ b/sys/contrib/zstd/lib/freebsd/assert.h
@@ -0,0 +1,2 @@
+/* This file is in the public domain */
+#include <sys/kassert.h>