diff --git a/CMakeLists.txt b/CMakeLists.txt
index fbed9cb2..6831d829 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,8 +5,6 @@ cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
 set( CMAKE_CXX_STANDARD_REQUIRED TRUE )
 set( CMAKE_CXX_STANDARD 11 )
 
-set(OpenMesh_RootDir ${CMAKE_CURRENT_LIST_DIR})
-
 enable_testing()
 
 # Only set project name if OpenMesh is built as stand-alone library
diff --git a/src/OpenMesh/Core/CMakeLists.txt b/src/OpenMesh/Core/CMakeLists.txt
index 84500054..0bdf5c50 100644
--- a/src/OpenMesh/Core/CMakeLists.txt
+++ b/src/OpenMesh/Core/CMakeLists.txt
@@ -133,7 +133,7 @@ install(DIRECTORY IO/
 endif ()
 
 target_include_directories(OpenMeshCore PUBLIC
-  $<BUILD_INTERFACE:${OpenMesh_RootDir}/src>
+  $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/src>
   $<INSTALL_INTERFACE:include>)
 
 install(TARGETS OpenMeshCore EXPORT OpenMeshConfig
diff --git a/src/OpenMesh/Tools/CMakeLists.txt b/src/OpenMesh/Tools/CMakeLists.txt
index cdc782e0..b1fd0f34 100644
--- a/src/OpenMesh/Tools/CMakeLists.txt
+++ b/src/OpenMesh/Tools/CMakeLists.txt
@@ -116,7 +116,7 @@ install(FILES Utils/getopt.h DESTINATION include/OpenMesh/Tools/Utils)
 endif ()
 
 target_include_directories(OpenMeshTools PUBLIC
-  $<BUILD_INTERFACE:${OpenMesh_RootDir}/src>
+  $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/src>
   $<INSTALL_INTERFACE:include>)
 
 install(TARGETS OpenMeshTools EXPORT OpenMeshConfig