diff --git a/CMakeLists.txt b/CMakeLists.txt
index 93a23f2..9c6cd02 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,6 +34,9 @@ option( BUILD_ALL               "Build all"                   ON )
 option( BUILD_DOC               "Build documentation"         ${BUILD_ALL} )
 # option( BUILD_TRANSLATIONS      "Build translations"          ${BUILD_ALL} )
 
+### Other options ##############################################################
+set(XDG_PREFIX "/usr")
+
 ### Configure checks ###########################################################
 include( ConfigureChecks.cmake )
 
diff --git a/interfaces/CMakeLists.txt b/interfaces/CMakeLists.txt
index df05b75..f01262c 100644
--- a/interfaces/CMakeLists.txt
+++ b/interfaces/CMakeLists.txt
@@ -36,7 +36,7 @@ configure_file(org.freedesktop.impl.portal.desktop.tde.service.cmake
 configure_file(xdg-desktop-portal-tde.desktop.cmake
                xdg-desktop-portal-tde.desktop @ONLY)
 
-install(FILES tde.portal DESTINATION ${SHARE_INSTALL_PREFIX}/xdg-desktop-portal/portals)
+install(FILES tde.portal DESTINATION ${XDG_PREFIX}/share/xdg-desktop-portal/portals)
 
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/org.freedesktop.impl.portal.desktop.tde.service
         DESTINATION ${DBUS_SESSION_DIRECTORY})