diff --git a/desktop/kde/applications/kalgebra/pspec.xml b/desktop/kde/applications/kalgebra/pspec.xml
index d62f65ce24..3e46ffc418 100644
--- a/desktop/kde/applications/kalgebra/pspec.xml
+++ b/desktop/kde/applications/kalgebra/pspec.xml
@@ -35,6 +35,8 @@
             <Dependency>kio-devel</Dependency>
             <Dependency>extra-cmake-modules</Dependency>
             <Dependency>qt5-webengine-devel</Dependency>
+            <Dependency>ffmpeg-devel</Dependency>
+            <Dependency>libXScrnSaver-devel</Dependency>
         </BuildDependencies>
     </Source>