diff --git a/kolourpaint.spec b/kolourpaint.spec
index 5f64048..40b6e72 100644
--- a/kolourpaint.spec
+++ b/kolourpaint.spec
@@ -1,3 +1,5 @@
+%undefine __cmake_in_source_build
+
 Name:    kolourpaint
 Summary: An easy-to-use paint program 
 Version: 20.04.3
@@ -51,16 +53,12 @@ License: LGPLv2
 
 
 %build
-mkdir %{_target_platform}
-pushd %{_target_platform}
-%{cmake_kf5} ..
-popd
-
-make %{?_smp_mflags} -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