diff --git a/kdecoration6.spec b/kdecoration6.spec
index d88c83a..4f599bb 100644
--- a/kdecoration6.spec
+++ b/kdecoration6.spec
@@ -63,7 +63,7 @@ Summary:        KDE's window decorations library (development package)
 Requires:       libkdecorations2-%{sover} = %{version}
 Requires:       libkdecorations2private%{private_sover} = %{version}
 Requires:       cmake(Qt6Gui)
-Conflicts:      libkdecoration2-devel
+Obsoletes:      libkdecoration2-devel < %{version}
 
 %description devel
 Development files belonging to kdecoration,