diff --git a/Make.sysdefs b/Make.sysdefs
index e68174ab..a2795adf 100644
--- a/Make.sysdefs
+++ b/Make.sysdefs
@@ -57,7 +57,7 @@ LINUXCFLAGS = -g -Wall -W -Wno-unused -D__USE_BSD -DLISTENMAXCONN=5 -DRel4
 LINUXLFLAGS = 
 LINUXMASTER = GLOBALCFLAGS="$(LINUXCFLAGS)" GLOBALLFLAGS="$(LINUXLFLAGS)" CLIENTLIBS=-lncurses
 
-LINUXPTHCFLAGS = -g -Wall -W -Wno-unused -D_EMPTH_POSIX=1 -U_EMPTH_LWP -D__USE_BSD -DLISTENMAXCONN=5 -DRel4
+LINUXPTHCFLAGS = -g -Wall -W -Wno-unused -D_EMPTH_POSIX=1 -U_EMPTH_LWP -DLISTENMAXCONN=5 -DRel4
 LINUXPTHLFLAGS = -lpthread
 LINUXPTHMASTER = GLOBALCFLAGS="$(LINUXPTHCFLAGS)" GLOBALLFLAGS="$(LINUXPTHLFLAGS)" CLIENTLIBS=-lncurses