diff --git a/CMakeLists.txt b/CMakeLists.txt
index 310f720..3e7d906 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,7 @@ set(LIBEXSLT_VERSION_EXTRA "")
 set(VERSION ${LIBXSLT_DOTTED_VERSION})
 set(LIBEXSLT_VERSION ${LIBEXSLT_DOTTED_VERSION})
 
-project(libxslt1 VERSION ${VERSION} LANGUAGES C)
+project(libxslt1 VERSION ${VERSION} LANGUAGES C CXX)
 
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR})