diff --git a/sml/Makefile b/sml/Makefile
index fdbe80f..bb485ad 100644
--- a/sml/Makefile
+++ b/sml/Makefile
@@ -1,4 +1,7 @@
-CFLAGS+=-I./include/ -fPIC -g -Wall
+CFLAGS += -I./include/ -fPIC -g -Wall
+
+# Available Flags:
+# _NO_UUID_LIB - compile without uuid lib
 
 LIB_DIR=./lib
 OBJ_LIB=$(LIB_DIR)/libsml.o
diff --git a/sml/src/sml_octet_string.c b/sml/src/sml_octet_string.c
index f223891..4735560 100644
--- a/sml/src/sml_octet_string.c
+++ b/sml/src/sml_octet_string.c
@@ -21,7 +21,7 @@
 
 #include <stdio.h>
 
-#ifdef SML_WITH_UUID_LIB
+#ifndef _NO_UUID_LIB
 #include <uuid/uuid.h>
 #endif
 
@@ -105,7 +105,7 @@ void sml_octet_string_write(octet_string *str, sml_buffer *buf) {
 }
 
 octet_string *sml_octet_string_generate_uuid() {
-#ifdef SML_WITH_UUID_LIB
+#ifndef _NO_UUID_LIB
     uuid_t uuid;
     uuid_generate(uuid);
     return sml_octet_string_init(uuid, 16);