diff --git a/configure.ac b/configure.ac
index b9375f1edacb6c04e252124528192cf182d2ea45..3a703750100a16a6dac3b6115b4a690e78ce5c96 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2566,7 +2566,7 @@ AC_ARG_WITH([ws-plugindir],
 
 if test "$with_wireshark_dissector" != "no" && test -z "$ws_plugindir"; then
     ws_version=`$WIRESHARK -v | head -1 | cut -f 2 -d' '`
-    ws_plugindir=`dirname $WIRESHARK`/../lib/wireshark/plugins/$ws_version
+    ws_plugindir="$libdir/wireshark/plugins/$ws_version"
 fi
 AC_SUBST([ws_plugindir])