diff --git a/PRINTCNF.COB b/PRINTCNF.COB
index ed89fed..95f367a 100644
--- a/PRINTCNF.COB
+++ b/PRINTCNF.COB
@@ -5,14 +5,17 @@
        INPUT-OUTPUT SECTION.
        FILE-CONTROL.
            SELECT CONFIG
+               ASSIGN TO DISK
                ORGANIZATION IS INDEXED
                ACCESS MODE IS SEQUENTIAL
                RECORD KEY IS CONFIG-KEY.
            SELECT USERS
+               ASSIGN TO DISK
                ORGANIZATION IS INDEXED
                ACCESS MODE IS SEQUENTIAL
                RECORD KEY IS USER-NAME.
            SELECT CHANNELS
+               ASSIGN TO DISK
                ORGANIZATION IS SEQUENTIAL.
 
        DATA DIVISION.
diff --git a/WOPO-CNF.COB b/WOPO-CNF.COB
index d9f5b98..28210a2 100644
--- a/WOPO-CNF.COB
+++ b/WOPO-CNF.COB
@@ -5,14 +5,17 @@
        INPUT-OUTPUT SECTION.
        FILE-CONTROL.
            SELECT CONFIG
+               ASSIGN TO DISK
                ORGANIZATION IS INDEXED
                ACCESS MODE IS RANDOM
                RECORD KEY IS CONFIG-KEY.
            SELECT USERS
+               ASSIGN TO DISK
                ORGANIZATION IS INDEXED
                ACCESS MODE IS RANDOM
                RECORD KEY IS USER-NAME.
            SELECT CHANNELS
+               ASSIGN TO DISK
                ORGANIZATION IS SEQUENTIAL.
 
        DATA DIVISION.
diff --git a/WOPO.COB b/WOPO.COB
index 3d468eb..e76be8f 100644
--- a/WOPO.COB
+++ b/WOPO.COB
@@ -5,14 +5,17 @@
        INPUT-OUTPUT SECTION.
        FILE-CONTROL.
            SELECT CONFIG
+               ASSIGN TO DISK
                ORGANIZATION IS INDEXED
                ACCESS MODE IS RANDOM
                RECORD KEY IS CONFIG-KEY.
            SELECT USERS
+               ASSIGN TO DISK
                ORGANIZATION IS INDEXED
                ACCESS MODE IS RANDOM
                RECORD KEY IS USER-NAME.
            SELECT CHANNELS
+               ASSIGN TO DISK
                ORGANIZATION IS SEQUENTIAL.
 
        DATA DIVISION.