diff --git a/CMakeLists.txt b/CMakeLists.txt
index ca23d62..354c01d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -103,6 +103,7 @@ find_package (Threads REQUIRED)
 
 # Logging.
 add_definitions (-DELPP_THREAD_SAFE -DELPP_DISABLE_DEFAULT_CRASH_HANDLING)
+add_definitions (-DELPP_NO_DEFAULT_LOG_FILE)
 check_include_file_cxx (syslog.h HAVE_SYSLOG_H)
 if (HAVE_SYSLOG_H)
   message ("-- Enabled syslog logging support")