diff --git a/config/ChangeLog b/config/ChangeLog
index 987fac78c..30f140d85 100644
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -17,6 +17,11 @@
 
 	* *.conf: changed top-level-occurs-clause "skip" to "unconformable"
 
+2022-07-12  Simon Sobisch <simonsobisch@gnu.org>
+
+	* ibm-strict.conf, mvs-strict.conf, gcos-strict.conf, bs2000-strict.conf:
+	  adjusted defaultbyte to 0
+
 2022-07-01  Simon Sobisch <simonsobisch@gnu.org>
 
 	* general: removed alias VALUES=VALUE, now a separate word
@@ -64,7 +69,7 @@
 2021-11-14  Ron Norman <rjn@inglenet.com>
 
 	* mf.words: Add MF specific names B-EXOR, B-LEFT, B-RIGHT for bit
-			operations
+	  operations
 
 2021-11-09  Ron Norman <rjn@inglenet.com>
 
@@ -723,7 +728,7 @@
 	* default.inc, Makefile.am: New files.
 
 
-Copyright 2003,2005-2007-2010,2014-2021 Free Software Foundation, Inc.
+Copyright 2003,2005-2007-2010,2014-2022 Free Software Foundation, Inc.
 
 Copying and distribution of this file, with or without modification, are
 permitted provided the copyright notice and this notice are preserved.
diff --git a/config/acu-strict.conf b/config/acu-strict.conf
index 65ee947ff..5e7e9a9a5 100644
--- a/config/acu-strict.conf
+++ b/config/acu-strict.conf
@@ -278,9 +278,9 @@ assign-disk-from:			unconformable
 vsam-status:				ignore
 self-call-recursive:		skip
 record-contains-depending-clause:	unconformable
-align-record: 4 
+align-record: 4
 align-opt: no
-defaultbyte: 32
+defaultbyte:		32
 
 # use fixed word list, synonyms and exceptions specified there
 reserved-words:		ACU
diff --git a/config/bs2000-strict.conf b/config/bs2000-strict.conf
index febaab438..50e6f8792 100644
--- a/config/bs2000-strict.conf
+++ b/config/bs2000-strict.conf
@@ -275,9 +275,9 @@ assign-disk-from:			unconformable
 vsam-status:				ok
 self-call-recursive:		skip
 record-contains-depending-clause:	unconformable
-align-record: 8 
+align-record: 8
 align-opt: no
-defaultbyte: ignore
+defaultbyte:		0 # not verified yet, but likely to be as IBM
 
 # use fixed word list, synonyms and exceptions specified there
 reserved-words:		BS2000
diff --git a/config/gcos-strict.conf b/config/gcos-strict.conf
index 3eb687574..38e3cb776 100644
--- a/config/gcos-strict.conf
+++ b/config/gcos-strict.conf
@@ -277,7 +277,7 @@ self-call-recursive:			skip
 record-contains-depending-clause:	obsolete
 align-record: 0		# TODO: verify
 align-opt: no		# TODO: verify
-defaultbyte: ignore
+defaultbyte:		0
 
 # use fixed word list, synonyms and exceptions specified there
 reserved-words:		GCOS
diff --git a/config/ibm-strict.conf b/config/ibm-strict.conf
index f8d16f708..7de96d8d2 100644
--- a/config/ibm-strict.conf
+++ b/config/ibm-strict.conf
@@ -274,7 +274,7 @@ self-call-recursive:		skip
 record-contains-depending-clause:	unconformable
 align-record: 8
 align-opt: yes
-defaultbyte: ignore
+defaultbyte: 0
 
 # use fixed word list, synonyms and exceptions specified there
 reserved-words:		IBM
diff --git a/config/mf-strict.conf b/config/mf-strict.conf
index 00e1172ba..8f9464fc6 100644
--- a/config/mf-strict.conf
+++ b/config/mf-strict.conf
@@ -278,7 +278,7 @@ self-call-recursive:		skip
 record-contains-depending-clause:	unconformable
 align-record: 8
 align-opt: yes
-defaultbyte: 32
+defaultbyte:		32
 
 # use fixed word list, synonyms and exceptions specified there
 reserved-words:		MF
diff --git a/config/mvs-strict.conf b/config/mvs-strict.conf
index 360bea670..2519c6c35 100644
--- a/config/mvs-strict.conf
+++ b/config/mvs-strict.conf
@@ -274,7 +274,7 @@ self-call-recursive:		skip
 record-contains-depending-clause:	unconformable
 align-record: 8
 align-opt: yes
-defaultbyte: ignore
+defaultbyte:		0 # not verified yet, but likely to be as IBM
 
 # use fixed word list, synonyms and exceptions specified there
 reserved-words:		MVS
diff --git a/config/realia-strict.conf b/config/realia-strict.conf
index e7bb3b102..5261a22de 100644
--- a/config/realia-strict.conf
+++ b/config/realia-strict.conf
@@ -280,7 +280,7 @@ self-call-recursive:		skip
 record-contains-depending-clause:	unconformable
 align-record: 0
 align-opt: no
-defaultbyte: ignore
+defaultbyte:		ignore # not verified yet, possibly like ACU/MF
 
 # use fixed word list, synonyms and exceptions specified there
 reserved-words:		realia