diff --git a/opm/json/CMakeLists.txt b/opm/json/CMakeLists.txt
index f8665c34f..b9b8757d6 100644
--- a/opm/json/CMakeLists.txt
+++ b/opm/json/CMakeLists.txt
@@ -1,6 +1,3 @@
-enable_language( C )
-
-
 if (NOT HAVE_CJSON)
     add_library( cjson cjson/cJSON.c )
     set( CJSON_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR} )