diff --git a/CMakeLists.txt b/CMakeLists.txt
index ccb3f2b..9f40d95 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,7 +70,12 @@ if(UNIX)
     if(XDG-DESKTOP-MENU_EXECUTABLE)
         install(SCRIPT install.cmake)
     else()
-        install(FILES org.nou.tenmon.desktop DESTINATION "$ENV{FLATPAK_DEST}/usr/share/applications")
-        install(FILES org.nou.tenmon.png DESTINATION "$ENV{FLATPAK_DEST}/usr/share/icons/hicolor/32x32/apps")
+        if(DEFINED ENV{FLATPAK_DEST})
+            install(FILES org.nou.tenmon.desktop DESTINATION "$ENV{FLATPAK_DEST}/share/applications")
+            install(FILES org.nou.tenmon.png DESTINATION "$ENV{FLATPAK_DEST}/share/icons/hicolor/32x32/apps")
+        else()
+            install(FILES org.nou.tenmon.desktop DESTINATION "/usr/share/applications")
+            install(FILES org.nou.tenmon.png DESTINATION "/usr/share/icons/hicolor/32x32/apps")
+        endif()
     endif()
 endif(UNIX)