diff --git a/CMake/3rdparty.cmake b/CMake/3rdparty.cmake
index 2c974e8..90707bd 100644
--- a/CMake/3rdparty.cmake
+++ b/CMake/3rdparty.cmake
@@ -94,7 +94,7 @@ if(DCMTK_USE_FIND_PACKAGE)
     else()
       message(STATUS "Info: DCMTK XML support will be enabled")
       set(WITH_LIBXML 1)
-      include_directories(${LIBXML2_INCLUDE_DIR})
+      include_directories(${LIBXML2_INCLUDE_DIRS})
       set(LIBXML_LIBS ${LIBXML2_LIBRARIES} ${LIBXML2_EXTRA_LIBS_STATIC})
     endif()
   endif()