diff --git a/Makefile.am b/Makefile.am
index 6271315..0191b06 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -23,7 +23,6 @@ ssldump_CPPFLAGS = \
 	-I$(top_srcdir)/null\
 	-I$(top_srcdir)/ssl\
 	-I$(top_srcdir)/base\
-	-D_BSD_SOURCE=1\
 	-D_DEFAULT_SOURCE=1\
 	-DLINUX