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-rw-r--r--src/algebra/outform.spad.pamphlet2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/algebra/outform.spad.pamphlet b/src/algebra/outform.spad.pamphlet
index 15f3c259..185d00dd 100644
--- a/src/algebra/outform.spad.pamphlet
+++ b/src/algebra/outform.spad.pamphlet
@@ -622,7 +622,7 @@ OutputForm(): SetCategory with
IDENTP$Lisp a => a
STRINGP$Lisp a => INTERN$Lisp a
return false
- if GET(e,QUOTE(INFIXOP$Lisp)$Lisp)$Lisp then true else false
+ if %property(e,'INFIXOP)$Foreign(Builtin) then true else false
elt(a, l) ==
cons(a, l)