diff --git a/tests/clock.test b/tests/clock.test
index 575f7f8..193836f 100644
--- a/tests/clock.test
+++ b/tests/clock.test
@@ -38213,10 +38213,13 @@ test clock-59.2 {correct time zone names, format and scan back, bug and regressi
     } {
 	set v [clock format $base -timezone Etc/GMT-2 -format "%Y-%m-%d %H:%M:%S %Z"]
 	lappend result [expr {[set t [clock scan $v -format "%Y-%m-%d %H:%M:%S %Z"]] == $base ? 1 : "0 ($t != $base for $v)"}]
-	lappend result [expr {[set t [clock scan $v]] == $base ? 1 : "0 ($t != $base for $v)"}]
+	# free-scan only for 8.6.16+ (tzdata called +0200 instead of +02 for Etc/GMT-2) to avoid confusion:
+	if {[package vsatisfies [package provide Tcl] 8.6.16]} {
+	    lappend result [expr {[set t [clock scan $v]] == $base ? 1 : "0 ($t != $base for $v)"}]
+	}
     }
     set result
-} [lrepeat 12 1]
+} [if {[package vsatisfies [package provide Tcl] 8.6.16]} {lrepeat 12 1} else {lrepeat 6 1}]
 
 # case-insensitive matching of weekday and month names [Bug 1781282]