diff --git a/regex.tal b/regex.tal
index e7c850b..6a124d3 100644
--- a/regex.tal
+++ b/regex.tal
@@ -778,7 +778,7 @@
     stack-exist ?&ok ;stack-is-empty errorm &ok JMP2r
 
 ( stack-pos points to the next free stack position (or the top if full). )
-@stack-pos :stack-bot ( the next position to insert at )
+@stack-pos =stack-bot ( the next position to insert at )
 
 ( stack-bot is the address of the first stack position. )
 ( stack-top is the address of the first byte beyond the stack. )
@@ -815,7 +815,7 @@
     STH2r JMP2r ( pos )
     &error POP2 POP2r ;arena-is-full errorm
 
-@arena-pos :arena-bot ( the next position to allocate )
+@arena-pos =arena-bot ( the next position to allocate )
 @arena-bot $400 @arena-top ( holds up to 1024 bytes )
 
 ( SUBGROUP OPERATIONS )
@@ -909,5 +909,5 @@
     ;subgroup-bot ;subgroup-pos STA2
     JMP2r
 
-@subgroup-pos :subgroup-bot ( the position of the first unallocated subgroup item )
+@subgroup-pos =subgroup-bot ( the position of the first unallocated subgroup item )
 @subgroup-bot $280 @subgroup-top ( holds up to 128 subgroup assignments (640 bytes) )