diff --git a/src/include/pgstat.h b/src/include/pgstat.h
index fb242e4..ea13d93 100644
--- a/src/include/pgstat.h
+++ b/src/include/pgstat.h
@@ -225,7 +225,7 @@ typedef struct PgStat_TableEntry
  * ----------
  */
 #define PGSTAT_NUM_TABENTRIES  \
-	((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - 3 * sizeof(int))  \
+	((PGSTAT_MSG_PAYLOAD - sizeof(Oid) - 3 * sizeof(int) - 2 * sizeof(PgStat_Counter))  \
 	 / sizeof(PgStat_TableEntry))
 
 typedef struct PgStat_MsgTabstat