meta-phosphor: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I588025b614416c43aa2d053765ab53bacf890cb5
diff --git a/meta-phosphor/recipes-phosphor/network/phosphor-snmp_git.bb b/meta-phosphor/recipes-phosphor/network/phosphor-snmp_git.bb
index 191ad92..349008f 100644
--- a/meta-phosphor/recipes-phosphor/network/phosphor-snmp_git.bb
+++ b/meta-phosphor/recipes-phosphor/network/phosphor-snmp_git.bb
@@ -14,7 +14,7 @@
 SRC_URI += "git://github.com/openbmc/phosphor-snmp"
 SRCREV = "9e60ef5f73de20555bbc197eb93ba888775e19e5"
 
-DBUS_SERVICE_${PN} += "xyz.openbmc_project.Network.SNMP.service"
+DBUS_SERVICE:${PN} += "xyz.openbmc_project.Network.SNMP.service"
 
 DEPENDS += "systemd"
 DEPENDS += "autoconf-archive-native"