--- a/ibus-anthy-1.5.0.ebuild	
+++ a/ibus-anthy-1.5.0.ebuild	
@@ -48,6 +48,8 @@ src_install() {
 	dodoc AUTHORS ChangeLog NEWS README
 
 	find "${ED}" -name '*.la' -type f -delete || die
+
+	python_optimize
 }
 
 pkg_preinst() {
@@ -60,8 +62,6 @@ pkg_postinst() {
 	elog
 	elog "# emerge app-dicts/kasumi"
 	elog
-
-	python_optimize
 }
 
 pkg_postrm() {