diff --git a/sys/boot/i386/loader/Makefile b/sys/boot/i386/loader/Makefile
index 036f699dbeb5..d5c057582241 100644
--- a/sys/boot/i386/loader/Makefile
+++ b/sys/boot/i386/loader/Makefile
@@ -25,7 +25,7 @@ CFLAGS+=	-DBOOT_FORTH -I${.CURDIR}/../../ficl -I${.CURDIR}/../../ficl/i386
 LIBFICL=	${.OBJDIR}/../../ficl/libficl.a
 .endif
 
-.if defined(LOADER_BZIP2_SUPPORT)
+.if !defined(LOADER_NO_BZIP2_SUPPORT)
 CFLAGS+=	-DLOADER_BZIP2_SUPPORT
 .endif
 .if !defined(LOADER_NO_GZIP_SUPPORT)