diff --git a/package/iptraf-ng/iptraf-ng.mk b/package/iptraf-ng/iptraf-ng.mk
index 7313873972..ea64e1dd23 100644
--- a/package/iptraf-ng/iptraf-ng.mk
+++ b/package/iptraf-ng/iptraf-ng.mk
@@ -10,6 +10,8 @@ IPTRAF_NG_LICENSE = GPLv2+
 IPTRAF_NG_LICENSE_FILES = LICENSE
 IPTRAF_NG_DEPENDENCIES = ncurses
 
-IPTRAF_NG_MAKE_ENV = NCURSES_LDFLAGS="-lpanel -lncurses"
+IPTRAF_NG_MAKE_ENV = \
+	NCURSES_LDFLAGS="-lpanel -lncurses" \
+	CFLAGS="$(TARGET_CFLAGS) -D_GNU_SOURCE"
 
 $(eval $(autotools-package))