diff --git a/conf/machine/am335x-nbhw16.conf b/conf/machine/am335x-nbhw16.conf
index 18be544..e8a37e9 100644
--- a/conf/machine/am335x-nbhw16.conf
+++ b/conf/machine/am335x-nbhw16.conf
@@ -18,8 +18,8 @@ KERNEL_DEVICETREE = "am335x-nbhw16.dtb \
     "
 KERNEL_IMAGETYPE = "zImage"
 
-PREFERRED_PROVIDER_virtual/kernel = "linux-netmodule"
-PV_pn-linux-netmodule = "4.4.71-${SRCPV}"
-SRC_URI_pn-linux-netmodule = "git://github.com/netmodule/linux.git;protocol=https;branch=nbhw16-4.4-pm-ti"
-SRCREV_pn-linux-netmodule = "eed94c91d489347af0d9d9aedfb460d7818ddd92"
+PREFERRED_PROVIDER_virtual/kernel ?= "linux-netmodule"
+PV_pn-linux-netmodule ?= "4.4.71-${SRCPV}"
+SRC_URI_pn-linux-netmodule ?= "git://github.com/netmodule/linux.git;protocol=https;branch=nbhw16-4.4-pm-ti"
+SRCREV_pn-linux-netmodule ?= "eed94c91d489347af0d9d9aedfb460d7818ddd92"