diff --git a/DefineOptions.cmake b/DefineOptions.cmake
index f06a5aea45..dcd67e4f1b 100644
--- a/DefineOptions.cmake
+++ b/DefineOptions.cmake
@@ -1,3 +1,4 @@
 option(WITH_LOG4C "Build csync without log4c" ON)
 option(UNIT_TESTING "Build with unit tests" OFF)
 option(MEM_NULL_TESTS "Enable NULL memory testing" OFF)
+option(LOG_TO_CALLBACK "Enable extended logging through a callback" OFF)
diff --git a/config.h.cmake b/config.h.cmake
index e4fd944abf..b2da0acc68 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -16,3 +16,4 @@
 #cmakedefine HAVE_LSTAT 1
 #cmakedefine HAVE_FNMATCH 1
 
+#cmakedefine LOG_TO_CALLBACK