diff --git a/dolphin.spec b/dolphin.spec
index 1e0c5d9..28353d0 100644
--- a/dolphin.spec
+++ b/dolphin.spec
@@ -44,6 +44,7 @@ BuildRequires:  cmake(KF5Completion)
 BuildRequires:  cmake(KF5TextWidgets)
 BuildRequires:  cmake(KF5Notifications)
 BuildRequires:  cmake(KF5Crash)
+BuildRequires:  cmake(KF5WindowSystem)
 
 BuildRequires:  phonon-qt5-devel