diff --git a/kdsingleapplication.spec b/kdsingleapplication.spec
index 5cf10f6..6c34807 100644
--- a/kdsingleapplication.spec
+++ b/kdsingleapplication.spec
@@ -68,6 +68,8 @@ Requires:       cmake(Qt6Widgets)
 Requires:       cmake(Qt5Network)
 Requires:       cmake(Qt5Widgets)
 %endif
+# Work around installcheck stupidity
+Conflicts:      libkdsingleapplication%{?pkg_suffix} = 1.0.0
 
 %description devel
 Development files for libkdsingleapplication%{?pkg_suffix}.