diff --git a/dns/dsc/Makefile b/dns/dsc/Makefile
index ccccc82524bf..47c897dcecd4 100644
--- a/dns/dsc/Makefile
+++ b/dns/dsc/Makefile
@@ -20,7 +20,7 @@ RUN_DEPENDS=	libpcap>=1.8.1:net/libpcap			\
 		dsp>=2.0.0:dns/dsp
 
 GNU_CONFIGURE=	yes
-CONFIGURE_ARGS+= --with-extra-cflags=-I${PREFIX}/include
+CONFIGURE_ARGS=	--with-extra-cflags=-I${LOCALBASE}/include
 USES=		gmake perl5 shebangfix
 
 SUB_FILES=	pkg-message