diff --git a/config.mk b/config.mk
index 88355c7..3c67547 100644
--- a/config.mk
+++ b/config.mk
@@ -20,7 +20,7 @@ LIBS = -L/usr/lib -lc -L${X11LIB} -lX11 -lutil -lXext -lXft \
 
 # flags
 CPPFLAGS = -DVERSION=\"${VERSION}\" -D_BSD_SOURCE -D_XOPEN_SOURCE=600
-CFLAGS += -g -std=c99 -pedantic -Wall -Wvariadic-macros -Os ${INCS} ${CPPFLAGS}
+CFLAGS += -std=c99 ${RPM_OPT_FLAGS} ${INCS} ${CPPFLAGS}
 LDFLAGS += -g ${LIBS}
 
 # compiler and linker