diff --git a/multimedia/libmpeg3/Makefile b/multimedia/libmpeg3/Makefile
index bd23e07ba4b9..76313623ae13 100644
--- a/multimedia/libmpeg3/Makefile
+++ b/multimedia/libmpeg3/Makefile
@@ -24,7 +24,7 @@ USE_GMAKE=	yes
 USE_GCC=	3.4+
 WRKSRC=		${WRKDIR}/${PORTNAME}-${PORTVERSION}
 NASM?=		${LOCALBASE}/bin/nasm
-MAKE_ENV=	NASM=${NASM} INSTALL=${INSTALL} ARCH=${ARCH} PTHREAD_LIBS=${PTHREAD_LIBS}
+MAKE_ENV=	NASM=${NASM} INSTALL='${INSTALL}' ARCH=${ARCH} PTHREAD_LIBS=${PTHREAD_LIBS}
 
 PORTDOCS=	index.html
 MPEG3_UTILS=	mpeg3cat mpeg3dump mpeg3peek mpeg3toc