diff --git a/daemon/ibus-daemon.in b/daemon/ibus-daemon.in
index 48522be7..f4a8f249 100644
--- a/daemon/ibus-daemon.in
+++ b/daemon/ibus-daemon.in
@@ -19,5 +19,6 @@
 # Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 # Boston, MA  02111-1307  USA
 
+export IBUS_PREFIX=@prefix@
 exec python @prefix@/share/ibus/daemon/ibusdaemon.py $@
 
diff --git a/gconf/ibus-gconf b/gconf/ibus-gconf
index f7ee86d6..0e3a03c5 100644
--- a/gconf/ibus-gconf
+++ b/gconf/ibus-gconf
@@ -19,5 +19,6 @@
 # Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 # Boston, MA  02111-1307  USA
 
+export IBUS_PREFIX=/usr
 exec python /usr/share/ibus/gconf/main.py $@
 
diff --git a/gconf/ibus-gconf.in b/gconf/ibus-gconf.in
index a662d343..c1fcf8b7 100644
--- a/gconf/ibus-gconf.in
+++ b/gconf/ibus-gconf.in
@@ -19,5 +19,6 @@
 # Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 # Boston, MA  02111-1307  USA
 
+export IBUS_PREFIX=@prefix@
 exec python @prefix@/share/ibus/gconf/main.py $@
 
diff --git a/setup/ibus-setup.in b/setup/ibus-setup.in
index cfba1ab9..936c2816 100644
--- a/setup/ibus-setup.in
+++ b/setup/ibus-setup.in
@@ -19,5 +19,6 @@
 # Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 # Boston, MA  02111-1307  USA
 
+export IBUS_PREFIX=@prefix@
 exec python @prefix@/share/ibus/setup/main.py $@