diff --git a/libmpdvdkit2/Makefile b/libmpdvdkit2/Makefile
index 16e142fa96..1d70d50eb1 100644
--- a/libmpdvdkit2/Makefile
+++ b/libmpdvdkit2/Makefile
@@ -34,8 +34,7 @@ endif
 #	 \ -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
 
 # -funroll-loops  removed, triggered gcc 3.0.4 (3.x?) bug
-CFLAGS= -I.. $(OPTFLAGS) \
-	-DSYS_LINUX -D__USE_UNIX98 -D_REENTRANT -D_GNU_SOURCE \
+CFLAGS= -I.. $(OPTFLAGS) -D__USE_UNIX98 -D_GNU_SOURCE \
 	-DHAVE_DVDCSS_DVDCSS_H -DSTDC_HEADERS -DHAVE_LIMITS_H \
 	-DHAVE_ERRNO_H -DHAVE_INTTYPES_H -DHAVE_UNISTD_H \
 	-DVERSION=\"1.2.9\"