diff --git a/package/kde/kdelibs/kdelibs.conf b/package/kde/kdelibs/kdelibs.conf
index 14331fe8e..90acb5c87 100644
--- a/package/kde/kdelibs/kdelibs.conf
+++ b/package/kde/kdelibs/kdelibs.conf
@@ -22,9 +22,9 @@
 
 . $base/package/*/*/kde-32.conf
 
-if ROCKCFG_PKG_KDE32_APIDOX ; then
+if [ "$ROCKCFG_PKG_KDE32_APIDOX" ] ; then
 	echo "KDE library documentation will be generated." 
-	makeinstopt="apidox $makeinstopt"
+	var_insert makeinstopt " " "apidox"
 fi
 
 kde_pm() {
@@ -40,3 +40,4 @@ EOP
 }
 
 hook_add postmake 3 kde_pm
+