diff --git a/sys/modules/Makefile b/sys/modules/Makefile
index 3a009f071ca..091fa754316 100644
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -67,7 +67,7 @@ SUBDIR=	\
 	${_bxe} \
 	${_bios} \
 	${_blake2} \
-	bnxt \
+	${_bnxt} \
 	bridgestp \
 	bwi \
 	bwn \
@@ -424,6 +424,12 @@ SUBDIR+=	dtrace
 SUBDIR+=	opensolaris
 .endif
 
+# Requires bus_space_read_8
+.if ${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "aarch64" || \
+	${MACHINE_ARCH} == "powerpc64" || ${MACHINE_ARCH} == "powerpc64le"
+_bnxt=		bnxt
+.endif
+
 .if ${MK_CRYPT} != "no" || defined(ALL_MODULES)
 .if exists(${SRCTOP}/sys/opencrypto)
 _crypto=	crypto