diff --git a/src/include/utils/date.h b/src/include/utils/date.h
index e17cd49602..eb6d2a16fe 100644
--- a/src/include/utils/date.h
+++ b/src/include/utils/date.h
@@ -17,6 +17,7 @@
 #include <math.h>
 
 #include "fmgr.h"
+#include "pgtime.h"
 #include "datatype/timestamp.h"
 
 typedef int32 DateADT;