diff --git a/config.mk b/config.mk
index cbf7d06f..7bedc254 100644
--- a/config.mk
+++ b/config.mk
@@ -19,7 +19,7 @@ LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 -L${PREFIX}/lib -lixp -lm
 # flags
 #CFLAGS = -Os ${INCS} -DVERSION=\"${VERSION}\"
 #LDFLAGS = ${LIBS}
-CFLAGS = -g -Wall -O2 ${INCS} -DVERSION=\"${VERSION}\"
+CFLAGS = -g -Wall ${INCS} -DVERSION=\"${VERSION}\"
 LDFLAGS = -g ${LIBS}
 
 # Solaris