diff --git a/graphics/svgalib/Makefile b/graphics/svgalib/Makefile
index 7813d81be171..2a3a4ce49b65 100644
--- a/graphics/svgalib/Makefile
+++ b/graphics/svgalib/Makefile
@@ -25,7 +25,7 @@ ALL_TARGET=	shared static
 .include <bsd.port.pre.mk>
 
 .if ${ARCH} != "i386"
-MAKE_ENV=	NO_ASM=y
+MAKE_ENV+=	NO_ASM=y
 .endif
 
 post-patch: .SILENT
diff --git a/sysutils/cdrdao/Makefile b/sysutils/cdrdao/Makefile
index f694bf0a1453..51acc01fc20f 100644
--- a/sysutils/cdrdao/Makefile
+++ b/sysutils/cdrdao/Makefile
@@ -69,7 +69,7 @@ CONFIGURE_ARGS+=	--with-mp3-support=no --with-ogg-support=no
 
 CONFIGURE_ARGS+=	--without-pcctsbin --without-pcctsinc \
 			--with-posix-threads=no --with-scglib
-MAKE_ENV=		CCOM=cc
+MAKE_ENV+=		CCOM=cc
 SCSILIBXARCH!=		${UNAME} -m
 
 post-extract:
diff --git a/sysutils/sformat/Makefile b/sysutils/sformat/Makefile
index a16c0324ed58..fbfa48312f5d 100644
--- a/sysutils/sformat/Makefile
+++ b/sysutils/sformat/Makefile
@@ -26,7 +26,7 @@ USES=		gmake
 .include <bsd.port.pre.mk>
 
 CCOM!=		${BASENAME} ${CC}
-MAKE_ENV=	CCOM=${CCOM}
+MAKE_ENV+=	CCOM=${CCOM}
 SFMTTARGET=	${ARCH:S/powerpc64/powerpc/}-freebsd-${CCOM}
 
 post-extract: