diff --git a/Makefile b/Makefile
index 9d98017..9f2e1fb 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 CC?=gcc
 INCLUDES?=-I/usr/local/include
 LIBDIRS?=-L/usr/local/lib
-CFLAGS?=-std=c99 -D_POSIX_C_SOURCE=2 -D_BSD_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -Wall -g $(INCLUDES)
+CFLAGS?=-std=c99 -O2 -Wall -g $(INCLUDES)
 LIB?=-lz -lcrypto
 LEX?=flex
 YACC?=yacc