diff --git a/sys/cam/mmc/mmc_sim.h b/sys/cam/mmc/mmc_sim.h
index 10bd183c307..18c49b3f57e 100644
--- a/sys/cam/mmc/mmc_sim.h
+++ b/sys/cam/mmc/mmc_sim.h
@@ -33,7 +33,7 @@
 struct mmc_sim {
 	struct mmc_cam_sim_softc	*sc;
 	struct mtx			mtx;
-	char				name[64];
+	char				name[16];
 	struct cam_devq			*devq;
 	struct cam_sim			*sim;
 	device_t			dev;