diff --git a/modules/FindMagnum.cmake b/modules/FindMagnum.cmake
index f111b2422..165c45ead 100644
--- a/modules/FindMagnum.cmake
+++ b/modules/FindMagnum.cmake
@@ -1040,6 +1040,7 @@ set(MAGNUM_PLUGINS_AUDIOIMPORTER_DEBUG_LIBRARY_INSTALL_DIR ${MAGNUM_PLUGINS_DEBU
 set(MAGNUM_PLUGINS_AUDIOIMPORTER_RELEASE_BINARY_INSTALL_DIR ${MAGNUM_PLUGINS_RELEASE_BINARY_INSTALL_DIR}/audioimporters)
 set(MAGNUM_PLUGINS_AUDIOIMPORTER_RELEASE_LIBRARY_INSTALL_DIR ${MAGNUM_PLUGINS_RELEASE_LIBRARY_INSTALL_DIR}/audioimporters)
 set(MAGNUM_INCLUDE_INSTALL_DIR ${MAGNUM_INCLUDE_INSTALL_PREFIX}/include/Magnum)
+set(MAGNUM_EXTERNAL_INCLUDE_INSTALL_DIR ${MAGNUM_INCLUDE_INSTALL_PREFIX}/include/MagnumExternal)
 set(MAGNUM_PLUGINS_INCLUDE_INSTALL_DIR ${MAGNUM_INCLUDE_INSTALL_PREFIX}/include/MagnumPlugins)
 
 # Get base plugin directory from main library location. This is *not* PATH,