diff --git a/interpreters/luamodules/luasyslog/CMakeLists.txt b/interpreters/luamodules/luasyslog/CMakeLists.txt
index 6f1fc2e1186..2046953cc4c 100644
--- a/interpreters/luamodules/luasyslog/CMakeLists.txt
+++ b/interpreters/luamodules/luasyslog/CMakeLists.txt
@@ -44,20 +44,6 @@ if(CONFIG_LUA_LSYSLOG_MODULE)
     endif()
   endif()
 
-  # ############################################################################
-  # Flags
-  # ############################################################################
-  set(LUA_SYSTEM_READLINE_DEF
-      [=[
-#define openlog(a,b,c) {(void)a; (void)c;}
-#define closelog() {}
-]=])
-
-  file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/def_lua_readline.h
-       "${LUA_SYSTEM_READLINE_DEF}")
-  list(APPEND CFLAGS
-       "SHELL:-include ${CMAKE_CURRENT_BINARY_DIR}/def_lua_readline.h")
-
   # ############################################################################
   # Sources
   # ############################################################################
diff --git a/interpreters/luamodules/luasyslog/Makefile b/interpreters/luamodules/luasyslog/Makefile
index 2421472f81d..1d53eccb450 100644
--- a/interpreters/luamodules/luasyslog/Makefile
+++ b/interpreters/luamodules/luasyslog/Makefile
@@ -32,9 +32,6 @@ LSYSLOG_SRC      = $(LSYSLOG_UNPACK)
 VPATH += $(LSYSLOG_SRC)
 CSRCS = lsyslog.c
 
-CFLAGS += -D'openlog(a,b,c)={(void)a; (void)c;}'
-CFLAGS += -D'closelog()={}'
-
 $(LSYSLOG_TARBALL):
 	$(Q) echo "Downloading $(LSYSLOG_TARBALL) from $(LSYSLOG_URL)"
 	$(Q) curl -O -L $(LSYSLOG_URL)