--- a/include/sm/os/sm_os_linux.h
+++ b/include/sm/os/sm_os_linux.h
@@ -33,7 +33,6 @@
 # endif /* LINUX_VERSION_CODE */
 #endif /* SM_CONF_SHM */
 
-#define SM_CONF_SYS_CDEFS_H	1
 #ifndef SM_CONF_SEM
 # define SM_CONF_SEM	2
 #endif /* SM_CONF_SEM */
