diff --git a/util/int/ChangeLog b/util/int/ChangeLog
index 8415e9a3..f89c1056 100644
--- a/util/int/ChangeLog
+++ b/util/int/ChangeLog
@@ -1,3 +1,6 @@
+26-Jan-90  Ceriel Jacobs (ceriel) at ceriel
+	Fixed check in COM instruction.
+
 26-Jan-90  Ceriel Jacobs (ceriel) at ceriel
 	Fixed so that two consecutive SIG's have no effect.
 
diff --git a/util/int/do_logic.c b/util/int/do_logic.c
index 13b3900c..f9e4071f 100644
--- a/util/int/do_logic.c
+++ b/util/int/do_logic.c
@@ -201,7 +201,7 @@ DoCOMz()
 	spoilFRA();
 	l = arg_w(l);
 	for (p = SP; p < (SP + l); p++) {
-		check_def(p, l);
+		check_def(p, 0);
 		stack_loc(p) = ~stack_loc(p);
 	}
 }