diff --git a/package/stefanp/psi/psi.conf b/package/stefanp/psi/psi.conf
index 1f04bc2ed..52782dacb 100644
--- a/package/stefanp/psi/psi.conf
+++ b/package/stefanp/psi/psi.conf
@@ -21,7 +21,7 @@
 # 
 # --- ROCK-COPYRIGHT-NOTE-END ---
 
-if [ -n "$ROCKCFG_PKG_KDE32_CORE_PREFIX" ] ; then
+if [ "$prefix_auto" = 1 -a -n "$ROCKCFG_PKG_KDE32_CORE_PREFIX" ] ; then
 	export KDEDIR="$root/$ROCKCFG_PKG_KDE32_CORE_PREFIX"
 	prefix=${ROCKCFG_PKG_KDE32_CORE_PREFIX} ; set_confopt
 fi