diff --git a/src/devices/wwan/nm-modem-ofono.c b/src/devices/wwan/nm-modem-ofono.c
index c639045d72..8618b47749 100644
--- a/src/devices/wwan/nm-modem-ofono.c
+++ b/src/devices/wwan/nm-modem-ofono.c
@@ -358,6 +358,7 @@ handle_sim_property (GDBusProxy *proxy,
 	}
 }
 
+static void
 sim_property_changed (GDBusProxy *proxy,
                       const char *property,
                       GVariant *v,