diff --git a/audio/libopenspc/Makefile b/audio/libopenspc/Makefile
index 62ef96f97d2e..4605dfbe528d 100644
--- a/audio/libopenspc/Makefile
+++ b/audio/libopenspc/Makefile
@@ -14,6 +14,8 @@ MASTER_SITE_SUBDIR=	kwm
 MAINTAINER=	kwm@FreeBSD.org
 COMMENT=	Library for playing SPC (SNES audio) files
 
+BUILD_DEPENDS=	nasm:${PORTSDIR}/devel/nasm
+
 GNU_CONFIGURE=	yes
 USE_GMAKE=	yes
 USE_LDCONFIG=	yes