diff --git a/src/Makefile.am b/src/Makefile.am
index a676aed..c1780f0 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,5 +1,4 @@
 
-CFLAGS_OPT  = -O3
 CFLAGS_WARN = -Wall -Wextra -Werror -Wno-unused-parameter
 
 bin_PROGRAMS = ttynvt
@@ -8,6 +7,6 @@ ttynvt_SOURCES = \
 	ttynvt.c nvt_log.c nvt_log.h \
 	telnet_basic.c telnet_rfc2217.c telnet.h telnet_param.h
 
-ttynvt_CPPFLAGS = -I$(top_builddir) $(FUSE_CFLAGS) $(CFLAGS_OPT) $(CFLAGS_WARN)
+ttynvt_CPPFLAGS = -I$(top_builddir) $(FUSE_CFLAGS) $(CFLAGS_WARN)
 
 ttynvt_LDADD = $(FUSE_LIBS)