diff --git a/webif/lib/auto/scan b/webif/lib/auto/scan
index 3926ad6..244271a 100755
--- a/webif/lib/auto/scan
+++ b/webif/lib/auto/scan
@@ -377,7 +377,11 @@ proc ::auto::runplugin {fn {_plugin ""} args} {
 			} else {
 				set call [list $rfn $args]
 			}
-			if {[catch {uplevel 1 {*}$call} msg]} {
+			set ologprefix $::auto::logprefix
+			set ::auto::logprefix "$plugin:$::auto::logprefix"
+			set ret [catch {uplevel 1 {*}$call} msg]
+			set ::auto::logprefix $ologprefix
+			if {$ret} {
 				log "$rfn: $msg" 0
 				lassign [info stacktrace] p f l
 				log "    $f:$l @ $p" 0