diff --git a/kblackbox.spec b/kblackbox.spec
index f48a945..f90ff5e 100644
--- a/kblackbox.spec
+++ b/kblackbox.spec
@@ -1,3 +1,4 @@
+%undefine __cmake_in_source_build
 
 Name:    kblackbox
 Summary: A game of hide and seek played on a grid of boxes
@@ -64,16 +65,12 @@ the better (the lower) your score.
 
 
 %build
-mkdir %{_target_platform}
-pushd %{_target_platform}
-%{cmake_kf5} ..
-popd
-
-%make_build -C %{_target_platform}
+%{cmake_kf5}
+%cmake_build
 
 
 %install
-make install/fast DESTDIR=%{buildroot} -C %{_target_platform}
+%cmake_install
 
 %find_lang %{name} --all-name --with-html