diff --git a/zpcimon/optics_sclp.h b/zpcimon/optics_sclp.h
index b211e9ac..4b295bc5 100644
--- a/zpcimon/optics_sclp.h
+++ b/zpcimon/optics_sclp.h
@@ -1,6 +1,7 @@
 #include <stdint.h>
 
 #include "lib/pci_list.h"
+#include "lib/zt_common.h"
 
 #include "optics_info.h"