diff --git a/sgsnemu/Makefile.in b/sgsnemu/Makefile.in
index 392e78f..5cf2601 100644
--- a/sgsnemu/Makefile.in
+++ b/sgsnemu/Makefile.in
@@ -90,7 +90,7 @@
 
 LDFLAGS = -Wl,--rpath -Wl,/usr/local/lib @EXEC_LDFLAGS@
 
-CFLAGS = -O2 -D_GNU_SOURCE -fno-builtin -Wall -ansi -DSBINDIR='"$(sbindir)"' -ggdb -lgtp -L../gtp
+CFLAGS = -O2 -D_GNU_SOURCE -fno-builtin -Wall -DSBINDIR='"$(sbindir)"' -ggdb -lgtp -L../gtp
 
 sgsnemu_SOURCES = sgsnemu.c tun.c tun.h cmdline.c cmdline.h ippool.h ippool.c syserr.h syserr.c
 subdir = sgsnemu