diff --git a/defs128.inc b/defs128.inc
index 299bfc9..cdd094e 100644
--- a/defs128.inc
+++ b/defs128.inc
@@ -21,6 +21,7 @@ MEMSIZ  = $39
 ; common
 VERCK   = $0C
 COUNT   = $0D
+INDEX   = $24
 
 ; editor
 KEYTAB  = $CC    ; Keyscan Table Pointer
diff --git a/defs64.inc b/defs64.inc
index b891ebc..cde96b1 100644
--- a/defs64.inc
+++ b/defs64.inc
@@ -8,6 +8,7 @@ NDX    = $C6    ; keyboard buffer count for C64 screen editor
 COLOR  = $0286  ; current foreground color
 XMAX   = $0289  ; Maximum Keyboard Buffer Size
 
+INDEX  = $22    ; Temporary pointer used when traversing text
 TXTTAB = $2B    ; Pointer to the Start of BASIC Program Text
 VARTAB = $2D    ; Pointer to the Start of the BASIC Variable Storage Area
 ARYTAB = $2F    ; Pointer to the Start of the BASIC Array Storage Area