diff --git a/libraries/input-plugins/CMakeLists.txt b/libraries/input-plugins/CMakeLists.txt
index 4428327deb..5d6dae7ad1 100644
--- a/libraries/input-plugins/CMakeLists.txt
+++ b/libraries/input-plugins/CMakeLists.txt
@@ -6,7 +6,7 @@ foreach(EXTERNAL ${OPTIONAL_EXTERNALS})
   string(TOUPPER ${EXTERNAL} ${EXTERNAL}_UPPERCASE)
   if (NOT ${${EXTERNAL}_UPPERCASE}_ROOT_DIR)
     string(TOLOWER ${EXTERNAL} ${EXTERNAL}_LOWERCASE)
-    set(${${EXTERNAL}_UPPERCASE}_ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/external/${${EXTERNAL}_LOWERCASE}")
+    set(${${EXTERNAL}_UPPERCASE}_ROOT_DIR "${CMAKE_SOURCE_DIR}/interface/external/${${EXTERNAL}_LOWERCASE}")
   endif ()
 endforeach()