diff --git a/src/backend/access/transam/commit_ts.c b/src/backend/access/transam/commit_ts.c
index 7b7bf2b2bf..1c19ed28ec 100644
--- a/src/backend/access/transam/commit_ts.c
+++ b/src/backend/access/transam/commit_ts.c
@@ -64,7 +64,7 @@ typedef struct CommitTimestampEntry
 									sizeof(RepOriginId))
 
 #define COMMIT_TS_XACTS_PER_PAGE \
-	(BLCKSZ / SizeOfCommitTimestampEntry)
+	(BLCKSZ - CHKSUMSZ / SizeOfCommitTimestampEntry)
 
 #define TransactionIdToCTsPage(xid) \
 	((xid) / (TransactionId) COMMIT_TS_XACTS_PER_PAGE)
diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c
index 35a3d36a7a..f5b0a7782b 100644
--- a/src/backend/access/transam/multixact.c
+++ b/src/backend/access/transam/multixact.c
@@ -138,7 +138,7 @@
 /* size in bytes of a complete group */
 #define MULTIXACT_MEMBERGROUP_SIZE \
 	(sizeof(TransactionId) * MULTIXACT_MEMBERS_PER_MEMBERGROUP + MULTIXACT_FLAGBYTES_PER_GROUP)
-#define MULTIXACT_MEMBERGROUPS_PER_PAGE (BLCKSZ / MULTIXACT_MEMBERGROUP_SIZE)
+#define MULTIXACT_MEMBERGROUPS_PER_PAGE ((BLCKSZ - CHKSUMSZ) / MULTIXACT_MEMBERGROUP_SIZE)
 #define MULTIXACT_MEMBERS_PER_PAGE	\
 	(MULTIXACT_MEMBERGROUPS_PER_PAGE * MULTIXACT_MEMBERS_PER_MEMBERGROUP)
 
diff --git a/src/backend/access/transam/subtrans.c b/src/backend/access/transam/subtrans.c
index f640661130..80420cb7a4 100644
--- a/src/backend/access/transam/subtrans.c
+++ b/src/backend/access/transam/subtrans.c
@@ -49,7 +49,7 @@
  */
 
 /* We need four bytes per xact */
-#define SUBTRANS_XACTS_PER_PAGE (BLCKSZ / sizeof(TransactionId))
+#define SUBTRANS_XACTS_PER_PAGE ((BLCKSZ - CHKSUMSZ) / sizeof(TransactionId))
 
 #define TransactionIdToPage(xid) ((xid) / (TransactionId) SUBTRANS_XACTS_PER_PAGE)
 #define TransactionIdToEntry(xid) ((xid) % (TransactionId) SUBTRANS_XACTS_PER_PAGE)
diff --git a/src/backend/commands/async.c b/src/backend/commands/async.c
index f7de742a56..8f672635e3 100644
--- a/src/backend/commands/async.c
+++ b/src/backend/commands/async.c
@@ -150,7 +150,7 @@
  * than that, so changes in that data structure won't affect user-visible
  * restrictions.
  */
-#define NOTIFY_PAYLOAD_MAX_LENGTH	(BLCKSZ - NAMEDATALEN - 128)
+#define NOTIFY_PAYLOAD_MAX_LENGTH	(BLCKSZ - NAMEDATALEN - 128 - CHKSUMSZ)
 
 /*
  * Struct representing an entry in the global notify queue
diff --git a/src/backend/storage/lmgr/predicate.c b/src/backend/storage/lmgr/predicate.c
index 251a359bff..de8b74820e 100644
--- a/src/backend/storage/lmgr/predicate.c
+++ b/src/backend/storage/lmgr/predicate.c
@@ -315,7 +315,7 @@ static SlruCtlData OldSerXidSlruCtlData;
 
 #define OLDSERXID_PAGESIZE			BLCKSZ
 #define OLDSERXID_ENTRYSIZE			sizeof(SerCommitSeqNo)
-#define OLDSERXID_ENTRIESPERPAGE	(OLDSERXID_PAGESIZE / OLDSERXID_ENTRYSIZE)
+#define OLDSERXID_ENTRIESPERPAGE	((OLDSERXID_PAGESIZE - CHKSUMSZ) / OLDSERXID_ENTRYSIZE)
 
 /*
  * Set maximum pages based on the lesser of the number needed to track all