diff --git a/yocto-poky/meta/classes/ptest-gnome.bbclass b/yocto-poky/meta/classes/ptest-gnome.bbclass
index b2949af..478a334 100644
--- a/yocto-poky/meta/classes/ptest-gnome.bbclass
+++ b/yocto-poky/meta/classes/ptest-gnome.bbclass
@@ -1,6 +1,6 @@
 inherit ptest
 
-EXTRA_OECONF_append_class-target = " ${@bb.utils.contains('PTEST_ENABLED', '1', '--enable-installed-tests', '--disable-installed-tests', d)}"
+EXTRA_OECONF_append = " ${@bb.utils.contains('PTEST_ENABLED', '1', '--enable-installed-tests', '--disable-installed-tests', d)}"
 
 FILES_${PN}-ptest += "${libexecdir}/installed-tests/ \
                       ${datadir}/installed-tests/"