diff --git a/package/iptraf-ng/iptraf-ng.mk b/package/iptraf-ng/iptraf-ng.mk
index ea64e1dd23..a36c7089fb 100644
--- a/package/iptraf-ng/iptraf-ng.mk
+++ b/package/iptraf-ng/iptraf-ng.mk
@@ -11,7 +11,9 @@ IPTRAF_NG_LICENSE_FILES = LICENSE
 IPTRAF_NG_DEPENDENCIES = ncurses
 
 IPTRAF_NG_MAKE_ENV = \
-	NCURSES_LDFLAGS="-lpanel -lncurses" \
+	NCURSES_LDFLAGS="-lpanel -lncurses"
+
+IPTRAF_NG_CONF_ENV = \
 	CFLAGS="$(TARGET_CFLAGS) -D_GNU_SOURCE"
 
 $(eval $(autotools-package))