diff --git a/backends/lakeroad/lakeroad.cc b/backends/lakeroad/lakeroad.cc
index c31cd965bcc..633038ae143 100644
--- a/backends/lakeroad/lakeroad.cc
+++ b/backends/lakeroad/lakeroad.cc
@@ -26,6 +26,7 @@
 #include "kernel/sigtools.h"
 #include "kernel/yw.h"
 #include <string>
+#include <assert.h>
 
 USING_YOSYS_NAMESPACE
 PRIVATE_NAMESPACE_BEGIN