diff --git a/src/ivfutils.c b/src/ivfutils.c
index c02be74..9e02406 100644
--- a/src/ivfutils.c
+++ b/src/ivfutils.c
@@ -4,6 +4,10 @@
 #include "storage/bufmgr.h"
 #include "vector.h"
 
+#if PG_VERSION_NUM < 130000
+#define TYPSTORAGE_PLAIN 'p'
+#endif
+
 /*
  * Allocate a vector array
  */