diff --git a/kf5-sonnet.spec b/kf5-sonnet.spec
index f69b730..97918e1 100644
--- a/kf5-sonnet.spec
+++ b/kf5-sonnet.spec
@@ -1,4 +1,3 @@
-%undefine __cmake_in_source_build
 %global framework sonnet
 
 # uncomment to enable bootstrap mode
@@ -113,7 +112,7 @@ make test ARGS="--output-on-failure --timeout 300" -C %{_target_platform} ||:
 %{_kf5_qtplugindir}/designer/*5widgets.so
 
 %files devel
-
+%{_kf5_includedir}/Sonnet/
 %{_kf5_includedir}/SonnetCore/
 %{_kf5_includedir}/SonnetUi/
 %{_kf5_libdir}/libKF5SonnetCore.so