diff --git a/sbin/hastd/pjdlog.c b/sbin/hastd/pjdlog.c
index 34921e2b2a86..6891893cea84 100644
--- a/sbin/hastd/pjdlog.c
+++ b/sbin/hastd/pjdlog.c
@@ -365,3 +365,23 @@ pjdlog_exitx(int exitcode, const char *fmt, ...)
 	/* NOTREACHED */
 	va_end(ap);
 }
+
+/*
+ * Log assertion and exit.
+ */
+void
+pjdlog_verify(const char *func, const char *file, int line,
+    const char *failedexpr)
+{
+
+	if (func == NULL) {
+		pjdlog_critical("Assertion failed: (%s), file %s, line %d.",
+		    failedexpr, file, line);
+	} else {
+		pjdlog_critical("Assertion failed: (%s), function %s, file %s, line %d.",
+		    failedexpr, func, file, line);
+	}
+	abort();
+        /* NOTREACHED */
+}
+
diff --git a/sbin/hastd/pjdlog.h b/sbin/hastd/pjdlog.h
index 2136b12f42ae..28b49dec7d78 100644
--- a/sbin/hastd/pjdlog.h
+++ b/sbin/hastd/pjdlog.h
@@ -85,4 +85,17 @@ void pjdlogv_exit(int exitcode, const char *fmt, va_list ap) __printflike(2, 0)
 void pjdlog_exitx(int exitcode, const char *fmt, ...) __printflike(2, 3) __dead2;
 void pjdlogv_exitx(int exitcode, const char *fmt, va_list ap) __printflike(2, 0) __dead2;
 
+void pjdlog_verify(const char *func, const char *file, int line,
+    const char *failedexpr) __dead2;
+
+#define	PJDLOG_VERIFY(expr)	do {					\
+	if (!(expr))							\
+		pjdlog_verify(__func__, __FILE__, __LINE__, #expr);	\
+} while (0)
+#ifdef NDEBUG
+#define	PJDLOG_ASSERT(expr)	do { } while (0)
+#else
+#define	PJDLOG_ASSERT(expr)	PJDLOG_VERIFY(expr)
+#endif
+
 #endif	/* !_PJDLOG_H_ */