diff --git a/modules/conop/src/CMakeLists.txt b/modules/conop/src/CMakeLists.txt
index c2f1f4c6d0148c62461be5852bd33872ad39f903..b45b11272b79a090210c3a3d7134676d83fcbc05 100644
--- a/modules/conop/src/CMakeLists.txt
+++ b/modules/conop/src/CMakeLists.txt
@@ -50,7 +50,7 @@ if (COMPOUND_LIB)
     install(FILES ${TO} DESTINATION "share/openstructure")
   else()
     message(FATAL_ERROR "${COMPOUND_LIB} does not exist. \n"
-            "Pass -DCOMPOUND_LIB=NONE if you would like to build "
+            "Pass -DCOMPOUND_LIB=OFF if you would like to build "
             "OpenStructure without a compound library")
   endif()